Cast when Stunned Support

Support, Spell, Trigger
Level: 1–20
Cooldown Time: 0.25 sec

Requires Level 38

Each supported spell skill will have a chance to be triggered when you are stunned. Cannot support skills used by totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.

You cannot Cast Supported Triggerable Spells directly
(50–69)% chance to Trigger Supported Spells when you are Stunned, or
Block a Stunning Hit

Additional Effects From Quality:
Supported Skills deal (0–10)% increased Damage

This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Unusual Gems /3

Type	Stats	Weight
Superior	Supported Skills deal (0–10)% increased Damage	50
Anomalous	Supported Skills have (0–20)% increased Skill Effect Duration	100
Divergent	(0–20)% chance to Trigger Supported Spells when you are Stunned, or Block a Stunning Hit	100

Quest /1

Act	Quest Complete	NPC	Character
4	The Eternal Nightmare	Petarus and Vanja	All Classes

Level Effect /40

Implicit
Cost & Reservation Multiplier: 100% You cannot Cast Supported Triggerable Spells directly

Level	Requires Level	Dexterity	Intelligence	50% chance to Trigger Supported Spells when you are Stunned, or Block a Stunning Hit	Experience
1	38	27	40	50	388,734
2	40	29	41	51	477,437
3	42	30	43	52	583,786
4	44	31	45	53	710,359
5	46	33	47	54	1,355,511
6	48	34	49	55	1,138,877
7	50	35	51	56	1,368,233
8	52	37	53	57	1,638,338
9	54	38	55	58	1,956,648
10	56	39	57	59	3,655,184
11	58	40	58	60	3,017,327
12	60	42	60	61	3,576,232
13	62	43	62	62	4,231,667
14	64	44	64	63	2,395,078
15	65	45	65	64	8,421,063
16	66	46	66	65	16,159,983
17	67	46	67	66	41,170,367
18	68	47	68	67	86,794,448
19	69	48	69	68	157,405,063
20	70	48	70	69
21	72			70
22	74			71
23	76			72
24	78			73
25	80			74
26	82			75
27	84			76
28	86			77
29	88			78
30	90			79
31	91			79
32	92			80
33	93			80
34	94			81
35	95			81
36	96			82
37	97			82
38	98			83
39	99			83
40	100			84

Reference	poe.ninja, Community Wiki
Acronym	Hit, Stun, Trigger, Block
DropLevel	38
BaseType	Cast when Stunned Support
Class	Support Skill Gems
Icon	!
Metadata	Metadata/Items/Gems/SupportGemCastOnStunned

Supported Gem /109 ⍟

Active Skill Gem	Description
Fireball	Unleashes a ball of fire towards a target which explodes, damaging nearby foes.
Ice Nova	A chilling circle of ice expands from the caster. If the caster targets near their Frostbolt projectiles, it will expand from a number of those projectiles instead. If this skill would repeat when cast this way, it will instead expand again from the same projectiles after a short delay.
Immortal Call	Take less Physical and Elemental Damage for a short time. Consumes up to 5 Endurance Charges to lengthen the buff and further lessen Physical Damage taken. Shares a cooldown with other Guard skills.
Cold Snap	Creates a sudden burst of cold in a targeted area, damaging enemies. This also creates an expanding area which is filled with chilled ground, and deals cold damage over time to enemies. Enemies that die while in the area have a chance to grant Frenzy Charges. The cooldown can be bypassed by expending a Frenzy Charge.
Raise Zombie	Raises a zombie minion from a corpse, which will follow you and attack enemies with a melee attack and an area of effect slam which cannot be evaded.
Detonate Dead	Targets a corpse, and deals spell damage to enemies around the corpse, as well as causing the corpse to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected.
Volatile Dead	Corpses near the targeted location explode, dealing damage in a small area and creating an orb which moves towards nearby enemies before dealing spell damage in a larger area. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.
Unearth	Fires a projectile that will pierce through enemies to impact the ground at the targeted location, creating a Bone Archer corpse where it lands.
Creeping Frost	Fire an icy projectile that bursts on impact or when reaching the targeted area, dealing area damage and creating a chilling area that deals cold damage over time. This area will creep across the ground towards nearby enemies until its duration expires.
Blood Rage	Adds a buff that deals Physical Damage over time, while increasing Attack Speed and Life Leech. Killing an enemy while this buff is active refreshes the buff duration, and can grant a Frenzy Charge.
Righteous Fire	Engulfs you in magical fire that rapidly burns you and nearby enemies. Your spell damage is substantially increased while under this effect. The effect ends when you have 1 life remaining.
Discharge	Discharge all the character's charges to deal elemental damage to all nearby monsters.
Portal	Creates a portal to the current area's town.
Spark	Launches unpredictable sparks that move randomly until they hit an enemy or expire.
Ice Spear	Launches shards of ice in rapid succession. After travelling a short distance they change to a second form, which moves much faster and pierces through enemies.
Raise Spectre	Raises a spectral version of a defeated foe as a minion to fight for you in battle.
Frost Wall	Creates a wall of ice which holds back enemies. Targets under the wall are damaged and pushed back.
Freezing Pulse	An icy projectile which has a chance to freeze enemies it passes through. The projectile fades quickly, reducing damage and freezing chance until it dissipates.
Shock Nova	Casts a ring of Lightning around you, followed by a larger Lightning nova. Each effect hits enemies caught in their area with Lightning Damage.
Phase Run	Gain a buff that makes you faster, harder to detect, and grants Phasing, letting you pass through enemies. Performing any skill replaces this buff with one that boosts melee physical damage of skills you use yourself (it will not apply to your melee skills used by totems). Consumes Frenzy Charges to increase duration.
Temporal Chains	Curses all enemies in an area, lowering their action speed and making other effects on them expire more slowly.
Elemental Weakness	Curses all targets in an area, lowering their elemental resistances.
Warlord's Mark	Curses a single enemy, giving a chance to double the duration of stuns on them. Attacking the cursed enemy will leech life and mana, stunning them will grant rage, and killing it will grant an endurance charge. You can only have one Mark at a time.
Punishment	Curses all targets in an area, causing them to be debilitated when they hit enemies and increasing damage they take while on low life. Some overkill damage from a killing blow on a cursed enemy will be reflected to surrounding targets.
Enfeeble	Curses all targets in an area, reducing their accuracy and making them deal less damage.
Assassin's Mark	Curses a single enemy, making them more vulnerable to Critical Strikes. Killing the cursed enemy will grant life and mana, and a power charge. You can only have one Mark at a time.
Sniper's Mark	Curses a single enemy, increasing the damage they take from projectiles, and making projectiles split when hitting them, to hit other targets around them. You can only have one Mark at a time.
Despair	Curses all targets in an area, lowering their chaos resistance and increasing damage over time they take. All hits will deal added chaos damage to the cursed enemies.
Lightning Warp	Waits for a duration before teleporting to a targeted destination, with the duration based on the distance and your movement speed. When the teleport occurs, lightning damage is dealt to the area around both where the player was and where they teleported to. Casting again will queue up multiple teleportations to occur in sequence.
Summon Skeletons	Summon Skeleton Warrior minions at the targeted location. They use a melee attack and die after a duration. If made aggressive, Skeleton Warriors will also dash towards nearby enemies.
Firestorm	Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.
Molten Shell	Applies a buff that adds to your armour, and can take some of the damage from hits for you before being depleted. When the buff expires or is depleted, the skill deals reflected damage to enemies around you based on the total damage that was taken from the buff. Shares a cooldown with other Guard skills.
Arc	An arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.
Ethereal Knives	Fires an arc of knives in front of the caster which deals physical damage.
Flammability	Curses all targets in an area, lowering their fire resistance and giving them a chance to be ignited when hit.
Frostbite	Curses all targets in an area, lowering their cold resistance and giving them a chance to be frozen when hit.
Conductivity	Curses all targets in an area, lowering their lightning resistance and giving them a chance to be shocked when hit.
Animate Guardian	Animates a melee weapon or armour, attaching it to an invisible Guardian that fights by your side. Animating multiple items attaches them to the same Guardian. You cannot animate unidentified items. Cannot be used by Traps or Mines.
Animate Weapon	Animates a Melee Weapon Item or Lingering Blade to fight by your side. You cannot animate unidentified Weapons. Will not animate weapons with 6 sockets unless specifically targeted. Cannot be used by Traps or Mines.
Storm Call	Sets a marker at a location. After a short duration, lightning strikes the marker, dealing damage around it. When this happens, it will also set off the lightning at any other markers you've cast.
Ball Lightning	Fires a slow-moving projectile that periodically damages enemies in an area around it with bolts of lightning.
Summon Raging Spirit	Summons a short-lived flaming skull that rushes at nearby enemies and attacks them rapidly. Enemies will not directly engage these spirits, and can pass through them.
Flame Surge	Strikes enemies in front of you with a surge of flame. Burning enemies are dealt more damage. If you hit an ignited enemy, will create burning ground under them. Your damage modifiers don't apply to this burning ground.
Desecrate	Desecrates the ground, summoning corpses and dealing chaos damage to all enemies in the area. The corpses will be chosen from the monsters in the current area and any Spectres that have existed in this instance.
Flesh Offering	Consumes a corpse, which temporarily empowers your minions with swiftness. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.
Bone Offering	Consumes a corpse, granting all of your minions the power to block both attacks and spells. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.
Spirit Offering	Consumes a corpse, granting increased critical strike chance and additional critical strike multiplier to your minions. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.
Glacial Cascade	Icicles emerge from the ground in a series of small bursts, each damaging enemies caught in the area and knocking them back in the direction of the next burst.
Convocation	Recalls all minions that are following you to your location, and grants them a temporary life regeneration effect.
Poacher's Mark	Curses a single enemy, lowering their physical damage reduction, and adding physical damage to all hits against them. Attacking the cursed enemy will grant life and mana, and killing them will grant a frenzy charge. You can only have one Mark at a time.
Summon Chaos Golem	Summons a Chaos Golem that grants you Physical Damage Reduction. The Chaos Golem can use a damage over time Chaos aura and a cascade of Chaos spikes in addition to its melee attack.
Summon Ice Golem	Summons an Ice Golem that grants you increased Critical Strike Chance and Accuracy. The Ice Golem can use an icy barrage spell and a chilling spinning dash in addition to its melee attack.
Summon Flame Golem	Summons a Flame Golem that grants you increased Damage. The Flame Golem can use a fire spray, a wave of fire damage, and an explosive arcing projectile.
Summon Lightning Golem	Summons a Lightning Golem that grants you increased Attack and Cast speed. The Lightning Golem fires a projectile spell, creates orbs of Lightning that zap nearby enemies, and casts a temporary aura that grants added Lightning Damage to spells and attacks used by the Golem and its nearby allies.
Detonate Mines	Detonates a Mine, starting a Detonation Sequence which will detonate other Mines around it.
Flame Dash	Teleport to a location, damaging enemies and leaving a trail of burning ground in your wake. Shares a cooldown with other Blink skills.
Rolling Magma	Lob a fiery orb that explodes as it hits the ground. The skill chains, releasing another fiery orb that repeats this effect.
Bladefall	Ethereal weapons rain from the sky, dealing damage to enemies in a sequence of volleys, each wider but less damaging than the last. Enemies can be hit multiple times where these overlap.
Blade Vortex	This spell creates ethereal blades which orbit in an area around you, dealing damage every 0.6 seconds to all enemies in their radius. As more blades are added, the damage becomes greater and more frequent.
Frost Bomb	Creates a crystal that pulses with cold for a duration. Each pulse applies a debuff to nearby enemies for a secondary duration which reduces life and energy shield regeneration rate, and also inflicts Cold Exposure. When the crystal's duration ends, it explodes, dealing heavy cold damage to enemies around it.
Orb of Storms	Creates a stationary electrical orb that strikes enemies in its area of effect with beams of lightning that can then split to hit more enemies. Modifiers to cast speed will increase how frequently it does this. Casting this skill again will replace the previous orb.
Summon Stone Golem	Summons a Stone Golem that grants you life regeneration. In addition to its melee attack, the Stone Golem uses a rolling charge and a powerful slam that can taunt enemies.
Contagion	Unleashes a vile contagion on enemies, dealing chaos damage over time. If an enemy dies while affected by Contagion, it spreads to other enemies.
Essence Drain	Fires a projectile that applies a damage over time debuff when it hits. You are healed for a portion of the debuff damage. The debuff is spread by Contagion.
Frostbolt	Fires a slow-moving projectile that pierces through enemies, dealing cold damage.
Vortex	An icy blast explodes around the caster, dealing cold damage to enemies, and leaving behind a whirling vortex which deals cold damage over time and chills enemies caught in it. If the caster targets near their Frostbolt projectiles, it will explode from a number of those projectiles instead, destroying them.
Dark Pact	This spell removes some life from one of your Skeleton minions near you or the targeted location to deal chaos damage in an area around it. This effect will chain to your other nearby skeletons. If you have no skeletons near you or the targeted location, it will sacrifice your own life to deal damage instead.
Cremation	A targeted corpse explodes, dealing area damage and turning into a volcanic geyser, which will repeatedly unleash projectiles sequentially over the surrounding area for a duration. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.
Bodyswap	Violently destroys your body and recreates it at the location of a targeted enemy or corpse, dealing spell damage in an area at both locations. If there is no specific target, it will prioritise corpses over enemies. If targeting a corpse, the corpse will also explode, dealing damage around it that is not affected by modifiers to spell damage, and cannot be reflected. This spell cannot be repeated.
Vulnerability	Curse all targets in an area, causing them to take increased physical damage. Attacks against the cursed enemies have a chance to inflict bleeding, and ailments inflicted on them will deal damage faster.
Summon Holy Relic	Summon a Holy Relic that stays near you. When you hit an enemy with an attack, the Holy Relic triggers a nova spell, with a very short cooldown, that deals physical damage to enemies and grants life regeneration to allies. This life regeneration is higher when applied to minions.
Storm Brand	Creates a magical brand which can attach to a nearby enemy. It periodically activates while attached, firing beams which deal damage to nearby enemies and those around them. The brand will detach if the enemy dies.
Armageddon Brand	Creates a magical brand which can attach to a nearby enemy. It periodically activates while attached, causing a fiery meteor to fall from the sky. The brand will detach if the enemy dies.
Brand Recall	Recall your brands to you, detaching them from enemies and increasing attachment range until they next attach to an enemy. Spends a portion of each recalled brand's cost to cause it to activate.
Purifying Flame	A wave of divine fire deals damage in a line, then creates Consecrated Ground and deals damage in an area around the targeted location. A larger shockwave then expands outwards, damaging enemies standing on Consecrated Ground that were not already hit.
Soulrend	Fires a projectile that turns towards enemies in front of it, damaging and piercing through those it hits, and leeching some of that damage as energy shield. As the projectile travels, it repeatedly applies a short but powerful chaos damage over time debuff to each enemy in an area around it.
Bane	Applies a debuff to enemies in an area, which deals chaos damage over Time. Linked hex curses are also applied to those enemies. The debuff deals more damage and lasts longer for each hex applied this way. This skill cannot be used by Totems, Traps, or Mines.
Wave of Conviction	An expanding wave of energy surges forward, damaging enemies in a cone-shaped area over a duration. Each enemy hit is inflicted with Exposure matching the element of which they took the highest damage. Only one Wave of Conviction can be active at a time
Steelskin	Applies a buff which can take some of the damage from hits for you before being depleted. Shares a cooldown with other Guard skills.
Berserk	Consumes Rage at an accelerating rate to provide a powerful buff, granting more attack damage, attack speed, movement speed, and less damage taken.
Frostblink	Teleport to a location, damaging enemies and leaving Chilled ground in an area at both ends of the teleport. Shares a cooldown with other Blink skills.
Summon Carrion Golem	Summons a Carrion Golem that grants added physical damage for your non-golem minions. The Carrion Golem attacks with a series of slashes that increase in speed and damage, as well as a cascade of bone spikes, and deals more damage for each of your non-golem minions near it.
Withering Step	Removes any existing Elusive buff before applying both Elusive and a buff that grants Phasing. While you have this buff, monsters that enter an area around you will be Withered. Using a skill or losing the Elusive buff ends this skill's effects. Shares a cooldown with other Blink skills.
Arcane Cloak	Spends a portion of your mana to grant a buff that takes some of the damage from hits for you until depleted. The buff grants added lightning damage based on the amount of mana spent by this skill. Shares a cooldown with other Guard skills.
Blade Blast	Deals spell damage in a targeted area. When this spell deals damage, if your Lingering Blades or Blade Vortex blades are nearby, it will detonate them, dealing damage again in an area around them. Up to 50 Blades can be detonated this way.
Penance Brand	Creates a magical brand which can attach to a nearby enemy. It periodically activates while attached, adding energy to the branded enemy. Each activation, energy spreads from each energised enemy to an enemy in range which is not energised by the brand. If the branded enemy has 20 energy, each activation will instead deal a pulse of area damage. Energy explodes when the energised enemy dies or the brand is removed, dealing damage in an area.
Wintertide Brand	Creates a magical brand which can attach to a nearby enemy, dealing cold damage over time and chilling them. It periodically activates while attached, gaining stages that raise the damage. When removed, a short-duration debuff dealing the same damage over time and chill is applied to each nearby enemy. The brand keeps its charges while detached.
Blazing Salvo	Fires projectiles which fly in an arc, exploding on impact with either enemies or the ground near where you target. Targeting farther away causes the projectiles to spread out and land over a wider area.
Void Sphere	Creates a Void Sphere which Hinders enemies in an area around it, with the debuff being stronger on enemies closer to the sphere. It also regularly releases pulses of area damage. The Void Sphere will consume the corpses of any enemies which die in its area. Can only have one Void Sphere at a time.
Crackling Lance	Release a beam which deals lightning damage to enemies in a long area in front of you, and has several smaller beams branch off from it at an angle, hitting more enemies to the sides.
Frost Shield	Place a Frost Shield that drains your energy shield for one second or until you run out, gaining stages while this drain occurs. The Frost Shield takes some damage from hits in place of you and allies while in its area. Enemies in the area are Chilled. You can only have one Frost Shield active at once.
Sigil of Power	Places a Sigil on the ground, which grants a buff to you and allies in the area around it for a duration. The Sigil gains stages as you spend mana in its area, making the buff more powerful. You can only have one Sigil of Power at a time.
Flame Wall	Create a wall of fire for a duration, which deals burning damage to everything in its area. Each enemy that enters the wall also receives a secondary burning debuff which persists for a short duration after leaving the wall. Any projectiles fired through the wall by you and allies deal added fire damage and apply the wall's secondary debuff on hit.
Hexblast	Deals chaos damage to a single enemy, dealing more damage if they are Hexed, then removes the Hex with the highest Doom. If a Hex was removed this way, also deals area damage to other enemies around the target, boosting damage and removing Hexes from those enemies in the same way.
Hydrosphere	Create a sphere of water, or move an existing sphere and reset its duration. The sphere continually applies a drenched debuff with a short duration to enemies in its area or those it moves through. You can hit the sphere with other skills to inflict Cold and Lightning Ailments (other than Chill). The sphere pulses when created, at regular intervals while afflicted by an Ailment, and after moving, damaging all drenched enemies in a large area.
Exsanguinate	Releases several tendrils of blood from your character, targeting enemies in a narrow angle in front of you. The beams deal physical damage and inflict a physical damage over time debuff to enemies, which can stack up to 3 times. Effects which allow skills to chain can apply to these tendrils.
Corrupting Fever	Draws out your own blood to power a buff for a duration, letting this skill inflict the Corrupting Blood debuff on enemies you hit, dealing physical damage over time for a short secondary duration. The buff's duration will be refreshed if you spend enough life before it expires.
Reap	A bloody scythe swipes across a selected area, applying a physical damage over time debuff in addition to hitting enemies with physical damage. If enemies survive, you gain a blood charge which raises the damage and cost of the skill. Players can have 5 maximum blood charges.
Voltaxic Burst	Each cast of this spell waits for a short duration, releasing a burst of lightning and chaos spell damage in an area around you when that duration ends. Enemies killed by this damage, or shortly after, will explode. The explosions of the corpses are not affected by modifiers to spell damage, and cannot be reflected.
Absolution	Damages enemies in an area, applying a debuff for a short duration. If a non-unique enemy dies while affected by the debuff, the enemy's corpse will be consumed to summon a Sentinel of Absolution for a longer secondary duration, or to refresh the duration and life of an existing one instead if you have the maximum number of them.
Ambush	Teleports you to a nearby enemy, applying a buff to you for a short duration and blinding the enemy for a secondary duration. Performing a melee attack with a One-Handed Weapon removes the buff to exert that attack.
Forbidden Rite	Lobs an exploding projectile near the targeted location, and extra projectiles toward enemies around you. The projectiles deal chaos damage based on your life and energy shield. Casting this spell damages you.
Manabond	Deals lightning damage based upon your missing mana in a circular area around the targeted location, as well as in four rectangular extensions whose lengths depend upon your remaining mana.
Summon Reaper	Summons a powerful Reaper which uses a variety of slashing area attacks. The Reaper's presence weakens your other minions, and it will consume them to temporarily empower and heal itself. Using this skill while the Reaper is already summoned causes it to dash to the targeted location and perform a powerful attack.
Eye of Winter	Fires a single eye projectile which constantly releases shard projectiles in a spiral. The shards will damage enemies they impact, dealing cold damage. The eye cannot damage enemies. When the eye dissipates or collides with terrain, it releases a faster spiral of extra shards.
Tornado	Create a Tornado that hinders and repeatedly damages enemies around it. It will move forward for a duration, during which your projectiles can collide with it to deal damage as though it was an enemy. Then it will chase down enemies for a secondary duration, and reflect a portion of the damage it took from your projectiles to them in addition to its own damage.
Lightning Conduit	Lightning strikes all Shocked enemies around a targeted location, then removes Shock from those enemies. Shocks cannot expire on enemies in range while casting this spell. Cannot be supported by Spell Cascade or Unleash.
Galvanic Field	Applies a buff boosting chance to shock. When you shock an enemy while you have this buff, creates a spherical field of energy attached to the shocked enemy for a duration, which will damage it and other nearby enemies with beams of lightning. The strength of the field depends on the magnitude of shock affecting the enemy when it is created.
Alchemist's Mark	Curses a single enemy, granting flask charges when you hit them and creating Burning Ground under them if your hit Ignites them, and Caustic Ground if it Poisons them. Damage modifiers do not apply to these ground effects. You can only have one Mark at a time.

Cast when Stunned Support Unique /1 ⍟

Name	Show Full Descriptions
	Night's Hold Black Maw Talisman Has 1 Socket local stat monsters pick up item [1] +2 to Level of Socketed Gems Socketed Gems are Supported by Level 10 Added Chaos Damage Socketed Gems are supported by Level 10 Blind Socketed Gems are supported by Level 10 Cast when Stunned Corrupted

Community Wiki

Wiki Edit

Cast when Stunned Support

CastOnStun Cast when Stunned Support is a Support gem that causes a linked Spell to Trigger when the player is stunned or blocks a stunning hit.

Skill functions and interactions

Cast when Stunned targets the enemy which stunned the player. Spells that don't have targeting, like Discharge or Ice Nova, will be cast on the character as usual.

When the character is stunned or blocks a stunning hit, the chance to activate supported spells is rolled individually for each linked spell, then all the spells that succeeded this chance check will activate at once. Multiple copies of the same spell cannot activate at the same time, only one can, however linking multiple copies of the same spell increases the chance that at least one of them activates.

After that the global CwS cooldown occurs, which is currently 250ms. Getting stunned during cooldown time will not cause any supported spells to activate, even if you have multiple CwS groups.

Strategy

Versus CastOnDmgTaken Cast when Damage Taken Support

Cast when Stunned has several advantages, which may tip its balance in its favour, depending on your character's build:

Characters who use energy shield or Mind Over Matter will typically have more hit points than their Life pool (for purposes of stunning). This also results in more stuns per damage taken.
Unlike Cast when Damage Taken Support , Cast when Stunned does not suffer a damage penalty at any level. However, it is usually still ineffective for damage-dealing purposes.
Most importantly, Cast when Stunned does not have a limit on active skill level. This makes it a better choice for level-dependent skills, since the trigger damage for Cast when Damage Taken Support increases rapidly with level.

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