Caustic Arrow

Attack, Projectile, AoE, Duration, Chaos, Bow
Level: 1–20
Cost: 6–10 Mana
Effectiveness of Added Damage: 55–64%
Projectile Speed: 3260
Radius: 20

Requires Level 1

Fires an arrow which deals chaos damage in an area on impact, and spreads caustic ground. Enemies standing on the caustic ground take chaos damage over time.

Deals (8.8–1927.1) Base Chaos Damage per second
Base duration is 2 seconds
60% of Physical Damage Converted to Chaos Damage
Modifiers to Projectile Damage apply to this Skill's Damage Over Time effect
+(0–6) to radius

Additional Effects From Quality:
(0–10)% increased Area of Effect

Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.

Unusual Gems /3

Type	Stats	Weight
Superior	(0–10)% increased Area of Effect	50
Anomalous	(0–20)% chance to inflict Withered for 2 seconds on Hit	100
Divergent	(0–20)% of Physical Damage Converted to Chaos Damage	100

Quest /2

Act	Quest Complete	NPC	Character
1	Enemy at the Gate	Quest Reward	Ranger
1	Enemy at the Gate	Nessa	Duelist Ranger Scion Shadow

Caustic Arrow /6

A projectile attack that creates a patch of caustic ground on hit which deals chaos damage over time to affected enemies.

Name	Show Full Descriptions
Pierce Support	Allows projectiles from Caustic Arrow to travel through more enemies, creating multiple patches of caustic ground, dealing damage to more enemies simultaneously.
Lesser Multiple Projectiles Support	Increases the amount of arrows Caustic Arrow fires, allowing it to cover a larger area by creating multiple patches of caustic ground at once. At later levels, obtain the Greater Multiple Projectiles Support gem to affect enemies in a larger area.
Mirage Archer Support	When Caustic Arrow hits an enemy, an apparition is created above you that fires a copy of Caustic Arrow at enemies, at a reduced rate and with less damage.
Vicious Projectiles Support	Greatly increases both the physical damage from hits and chaos damage over time component of Caustic Arrow.
Swift Affliction Support	Decreases the duration of Caustic Arrow's ground effect, but compensates for this by increasing damage over time dealt.
Void Manipulation Support	Grants more chaos damage but lowers the elemental damage of Caustic Arrow. The Caustic ground effect only deals chaos damage, so Void Manipulation gives more damage at no drawback.

Level Effect /40

Implicit
Base duration is 2 seconds 60% of Physical Damage Converted to Chaos Damage Modifiers to Projectile Damage apply to this Skill's Damage Over Time effect

Level	Requires Level	Dexterity	Cost	Base Damage	Deals 8.8 Base Chaos Damage per second	# to radius	Experience
1	1	10	6	55%	8.8	0	70
2	2	12	6	55.5%	10.1	0	308
3	4	16	6	56%	13.1	1	1,554
4	7	22	6	56.5%	18.4	1	6,667
5	11	31	7	57%	27.8	1	26,047
6	16	41	7	57.5%	44	2	49,725
7	20	50	7	58%	61.9	2	95,714
8	24	58	7	58.5%	85.4	2	169,595
9	28	67	8	59%	116.2	3	283,759
10	32	75	8	59.5%	156.4	3	453,996
11	36	83	8	59.9%	208.5	3	703,128
12	40	92	8	60.4%	275.9	3	1,061,223
13	44	100	9	60.9%	362.7	4	2,065,870
14	48	109	9	61.4%	474.1	4	2,507,110
15	52	117	9	61.9%	616.9	4	5,798,936
16	56	125	9	62.4%	799.3	5	15,083,919
17	60	134	10	62.9%	1031.9	5	27,792,735
18	64	142	10	63.4%	1327.6	5	43,869,739
19	67	148	10	63.9%	1600.8	6	242,081,556
20	70	155	10	64.4%	1927.1	6
21	72		11	64.9%	2179.2	6
22	74		11	65.4%	2462.7	7
23	76		11	65.9%	2781.5	7
24	78		11	66.4%	3139.9	7
25	80		12	66.9%	3542.6	8
26	82		12	67.4%	3995	8
27	84		12	67.9%	4503.1	8
28	86		12	68.4%	5073.4	9
29	88		13	68.9%	5713.5	9
30	90		13	69.4%	6431.6	9
31	91		13	69.8%	6822.8	9
32	92		13	70.3%	7237.1	10
33	93		14	70.8%	7675.8	10
34	94		14	71.3%	8140.3	10
35	95		14	71.8%	8632.2	11
36	96		14	72.3%	9152.9	11
37	97		15	72.8%	9704.2	11
38	98		15	73.3%	10287.7	12
39	99		15	73.8%	10905.4	12
40	100		15	74.3%	11559.3	12

Reference	poe.ninja, Community Wiki
Acronym	Projectile, Modifiers
BaseType	Caustic Arrow
Class	Active Skill Gems
Weapon	Bows
TargetTypes	Ground, Enemy
Type	Attack, RangedAttack, MirageArcherCanUse, Projectile, ProjectilesFromUser, Area, Duration, Trappable, Mineable, Totemable, DamageOverTime, Chaos, Triggerable
Metadata	Metadata/Items/Gems/SkillGemPoisonArrow

Caustic Arrow Monster /21 ⍟

Name	Modifiers	Spectre
Alira's Deadeye		Y
Shadow Archer		Y
Alira's Souleye		Y
Devoted Bandit		Y
Wolfpack Ranger		Y
Plagued Bowman	Undead monster fires caustic arrows text [1]	Y
Izioc, the Abyss	monster dropped item quantity +% [0] monster dropped item rarity +% [15000] monster slain experience +% [100] unique boss curse effect on self +% final [-33] cannot be taunted when taunted ms [0] monster penalty against minions damage +% final vs player minions [-20] cannot be stunned for ms after stun finished [2000] cannot be stunned while stunned [1]	Y
Lord of the Bow	monster dropped item quantity +% [0] monster dropped item rarity +% [15000] monster slain experience +% [100] 40% increased Attack Speed Skills fire 2 additional Projectiles unique boss curse effect on self +% final [-33] cannot be taunted when taunted ms [0] cannot be stunned for ms after stun finished [2000] cannot be stunned while stunned [1]	Y
Antalie Napora	monster base type attack cast speed +% and damage -% final [33] 20% increased Attack Speed	Y
Silva Fearsting	monster base type attack cast speed +% and damage -% final [33]	Y
Corrupted Deadeye	monster no map drops [1]	Y
Eyepecker	+1 to maximum number of Summoned Totems kill traps mines and totems on death [1]	Y
Stonebeak, Battle Fowl	cannot be taunted when taunted ms [0] unique boss curse effect on self +% final [-33] +1 to maximum number of Summoned Totems monster dropped item quantity +% [0] monster dropped item rarity +% [15000] monster slain experience +% [100] cannot be stunned for ms after stun finished [2000] cannot be stunned while stunned [1]	Y
Rudiarius Felix	monster base type attack cast speed +% and damage -% final [33] 20% increased Attack Speed Traps cannot be Damaged for +4 seconds after being Thrown Mines cannot be Damaged for +4 seconds after being thrown kill traps mines and totems on death [1]	Y
Rudiarius Felix	30% increased Movement Speed Traps cannot be Damaged for +4 seconds after being Thrown Mines cannot be Damaged for +4 seconds after being thrown	Y
Avatar of the Huntress	30% increased Movement Speed monster dropped item quantity +% [0] monster dropped item rarity +% [15000] monster slain experience +% [100] unique boss curse effect on self +% final [-33] Traps cannot be Damaged for +4 seconds after being Thrown Mines cannot be Damaged for +4 seconds after being thrown kill traps mines and totems on death [1] cannot be stunned for ms after stun finished [2000] cannot be stunned while stunned [1]	Y
Blackguard Jaeger	monster fires caustic arrows text [1]	Y
Blighted Deadeye	monster fires caustic arrows text [1]	Y
Clattering Experiment	monster no map drops [1]	Y
Clattering Experiment		Y
Clattering Bones	monster no map drops [1]	Y

Microtransactions /3 ⍟

Icon	Name
	Tentacle Caustic Arrow Effect Your Caustic Arrow becomes an area of ethereal purple tentacles.
	Celestial Caustic Arrow Effect Your Caustic Arrow becomes a Celestial Effect.
	Oblivion Caustic Arrow Effect Your Caustic Arrow becomes an Oblivion Effect.

Labyrinth Enchantment helmet /8 ⍟

Level	Name	Mod	Weight
The Merciless Labyrinth	Enchantment Caustic Arrow Damage 1	25% increased Caustic Arrow Damage	75
The Eternal Labyrinth	Enchantment Caustic Arrow Damage 2	40% increased Caustic Arrow Damage	75
The Merciless Labyrinth	Enchantment Caustic Arrow Duration 1	20% increased Caustic Arrow Duration	75
The Eternal Labyrinth	Enchantment Caustic Arrow Duration 2	30% increased Caustic Arrow Duration	75
The Merciless Labyrinth	Enchantment Caustic Arrow Area Of Effect 1	16% increased Caustic Arrow Area of Effect	75
The Eternal Labyrinth	Enchantment Caustic Arrow Area Of Effect 2	24% increased Caustic Arrow Area of Effect	75
The Merciless Labyrinth	Enchantment Caustic Arrow Wither On Hit 1	Caustic Arrow has 14% chance to inflict Withered on Hit for 2 seconds base Duration	75
The Eternal Labyrinth	Enchantment Caustic Arrow Wither On Hit 2	Caustic Arrow has 20% chance to inflict Withered on Hit for 2 seconds base Duration	75

Supported By /109 ⍟

Support Gem	Description
Added Fire Damage Support	Supports any skill that hits enemies.
Faster Attacks Support	Supports attack skills.
Greater Multiple Projectiles Support	Supports projectile skills.
Lesser Multiple Projectiles Support	Supports projectile skills.
Greater Volley Support	Supports skills that fire projectiles from the user. Does not affect projectiles fired from other locations as secondary effects.
Faster Projectiles Support	Supports projectile skills.
Added Cold Damage Support	Supports any skill that hits enemies.
Additional Accuracy Support	Supports attack skills.
Increased Area of Effect Support	Supports any skill with an area of effect.
Added Lightning Damage Support	Supports any skill that hits enemies.
Increased Critical Strikes Support	Supports any skill that hits enemies.
Increased Critical Damage Support	Supports any skill that hits enemies.
Knockback Support	Supports any skill that hits enemies.
Life Leech Support	Supports any skill that hits enemies, causing those hits to leech life based on damage dealt.
Mana Leech Support	Supports attack skills that hit enemies, causing those hits to leech mana based on damage dealt.
Added Chaos Damage Support	Supports any skill that hits enemies.
Stun Support	Supports any skill that hits enemies, making it easier to stun enemies with those skills.
Pierce Support	Supports projectile skills.
Trap Support	Supports spells, or attacks that use bows or wands. Instead of using that skill, you will throw a trap that will use the skill for you when an enemy walks near it. Traps cannot use channelling skills.
Item Rarity Support	Supports any skill that can kill enemies.
Concentrated Effect Support	Supports any skill with an area of effect, regardless of whether that skill deals damage.
Increased Duration Support	Supports any skill with a duration.
Cold to Fire Support	Supports any skill that hits enemies.
Combustion Support	Supports any skill that hits enemies.
Elemental Damage with Attacks Support	Supports attack skills.
Life Gain on Hit Support	Supports attack skills.
Elemental Proliferation Support	Supports any skill that hits enemies, or could otherwise apply elemental ailments.
Culling Strike Support	Supports any skill that hits enemies. If enemies are left below 10% of maximum life after being hit by these skills, they will be killed.
Point Blank Support	Supports projectile skills.
Iron Grip Support	Supports attack skills that fire projectiles, making the increase to physical melee damage from strength also increase their physical projectile damage.
Damage on Full Life Support	Supports attack skills, providing a bonus to all damage dealt by those skills while your life is full.
Blastchain Mine Support	Supports spells, or attacks that use bows or wands. Instead of using that skill, you will throw a mine that will use the skill for you when you detonate it. Mines cannot use channelling skills.
Chance to Flee Support	Supports any skill that hits enemies.
Blind Support	Supports any skill that hits enemies.
Ballista Totem Support	Supports any bow or wand attack skill, causing it to summon a ballista totem that uses the skill for you.
Fire Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy fire resistance.
Cold Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy cold resistance.
Lightning Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy lightning resistance.
Elemental Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy elemental resistances.
Chain Support	Supports projectile skills, and any other skills that chain.
Fork Support	Supports projectile skills, making their projectiles fork into two projectiles the first time they hit an enemy and don't pierce it.
Power Charge On Critical Support	Supports any skill that hits enemies.
Burning Damage Support	Supports any skill that hits enemies, or can deal burning damage directly.
Hextouch Support	Must support both a skill that hits enemies, and a hex curse skill to work. The hex will be applied when enemies are hit by the other skill. Cannot support totems, traps, or mines. Minions cannot apply hexes this way.
Cast On Critical Strike Support	Must support both an attack skill and a spell skill to work. The attack skill will trigger a spell when it critically strikes an enemy. Cannot support totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.
Slower Projectiles Support	Supports projectile skills.
Less Duration Support	Supports any skill that has a duration.
Vicious Projectiles Support	Supports projectile attack skills.
Block Chance Reduction Support	Supports any skill that hits enemies.
Physical to Lightning Support	Supports any skill that hits enemies.
Ice Bite Support	Supports any skill you use to hit enemies yourself. Cannot support skills used by totems, traps, or mines.
Hypothermia Support	Supports any skill that deals damage.
Innervate Support	Supports any skill you use to hit enemies yourself. Cannot support skills used by totems, traps, or mines.
Critical Strike Affliction Support	Supports any skill that hits enemies.
Void Manipulation Support	Supports any skill that deals damage.
Controlled Destruction Support	Supports attack skills, or spell skills that deal damage.
Swift Affliction Support	Supports any skill that has a duration, or can hit enemies to inflict ailments on them.
Elemental Focus Support	Supports any skill that hits or burns enemies, or inflicts elemental ailments.
Ignite Proliferation Support	Supports any skill that hits enemies.
Chance to Bleed Support	Supports attack skills. Cannot support skills that create minions.
Chance to Poison Support	Supports any skill that hits enemies.
Deadly Ailments Support	Supports any skill that hits enemies.
Decay Support	Supports any skill that hits enemies.
Efficacy Support	Supports any skill that deals damage or has a duration.
Vile Toxins Support	Supports any skill that hits enemies.
Maim Support	Supports attack skills, or other skills that can maim enemies.
Immolate Support	Supports any skill that hits enemies.
Unbound Ailments Support	Supports any skill that hits enemies or inflicts ailments
Brutality Support	Supports any skill that deals damage.
Onslaught Support	Supports any skill that hits enemies.
Volley Support	Supports skills that fire projectiles from the user. Does not affect projectiles fired from other locations as secondary effects.
Summon Phantasm Support	Supports skills that can hit enemies, or create minions. When those skills or minions kill enemies, or hit rare or unique enemies they will have a chance to summon a Phantasm minion, which uses a piercing projectile spell that deals physical damage.
Mirage Archer Support	Supports attack skills that can be used with bows. Supported skills can only be used with bows. Cannot support Vaal skills, minion skills, movement skills, or skills used by totems, traps, or mines.
Withering Touch Support	Supports attack skills.
Bonechill Support	Supports any skill that can chill enemies or create chilling areas.
Energy Leech Support	Supports any skill that hits enemies, causing those hits to leech energy shield based on damage dealt.
Impale Support	Supports attack skills.
Nightblade Support	Supports attack skills. Cannot support skills which create minions.
High-Impact Mine Support	Supports spells, or attacks that use bows or wands. Instead of using that skill, you will throw a mine that will use the skill for you when you detonate it. Mines cannot use channelling skills.
Arrow Nova Support	Supports bow attack skills that fire arrows forwards as projectiles. These skills will instead fire a payload arrow into the air to land at a targeted location. The supported skills' arrows will then fire out in a circle from where it lands. Cannot support skills that already fire arrows into the air, channelled skills, or skills that create Minions.
Barrage Support	Supports projectile attack skills that use bows or wands. Cannot support triggered skills, channelled skills, or skills that create Minions.
Awakened Added Fire Damage Support	Supports any skill that hits enemies.
Awakened Brutality Support	Supports any skill that deals damage.
Awakened Burning Damage Support	Supports any skill that hits enemies, or can deal burning damage directly.
Awakened Elemental Damage with Attacks Support	Supports attack skills.
Awakened Fire Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy fire resistance.
Awakened Added Cold Damage Support	Supports any skill that hits enemies.
Awakened Arrow Nova Support	Supports bow attack skills that fire arrows forwards as projectiles. These skills will instead fire a payload arrow into the air to land at a targeted location. The supported skills' arrows will then fire out in a circle from where it lands. Cannot support skills that already fire arrows into the air, channelled skills, or skills that create Minions.
Awakened Cast On Critical Strike Support	Must support both an attack skill and a spell skill to work. The attack skill will trigger a spell when it critically strikes an enemy. Cannot support totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.
Awakened Chain Support	Supports projectile skills, and any other skills that chain.
Awakened Cold Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy cold resistance.
Awakened Deadly Ailments Support	Supports any skill that hits enemies.
Awakened Fork Support	Supports projectile skills, making their projectiles fork into two projectiles the first two times they hit an enemy and don't pierce it.
Awakened Greater Multiple Projectiles Support	Supports projectile skills.
Awakened Swift Affliction Support	Supports any skill that has a duration, or can hit enemies to inflict ailments on them.
Awakened Void Manipulation Support	Supports any skill that deals damage.
Awakened Vicious Projectiles Support	Supports projectile attack skills.
Awakened Added Chaos Damage Support	Supports any skill that hits enemies.
Awakened Added Lightning Damage Support	Supports any skill that hits enemies.
Awakened Controlled Destruction Support	Supports attack skills, or spell skills that deal damage.
Awakened Hextouch Support	Must support both a skill that hits enemies, and a hex curse skill to work. The hex will be applied when enemies are hit by the other skill. Cannot support totems, traps, or mines. Minions cannot apply hexes this way.
Awakened Elemental Focus Support	Supports any skill that hits or burns enemies, or inflicts elemental ailments.
Awakened Increased Area of Effect Support	Supports any skill with an area of effect.
Awakened Lightning Penetration Support	Supports any skill that hits enemies, making those hits penetrate enemy lightning resistance.
Awakened Unbound Ailments Support	Supports any skill that hits enemies or inflicts ailments
Trinity Support	Supports skills that hit enemies, causing them to gain bonuses while you have resonance of all three elements, and to grant resonance of elements other than the highest one in a hit. There is a maximum of 50 Resonance for each Element. Cannot support triggered skills, instant skills, orb skills, brands, skills with a reservation, or skills used by totems, traps, or mines. Cannot modify the skills of minions.
Bloodthirst Support	Supports attack skills. Cannot support triggered skills, skills which create minions, or skills used by totems, traps or mines.
Cruelty Support	Supports any skill that hits enemies. Minions cannot gain Cruelty.
Overcharge Support	Supports any skill that hits enemies.

Community Wiki

Wiki Edit

Caustic Arrow

Caustic Arrow is a bow attack that fires an arrow dealing chaos damage and spreading caustic ground. Enemies standing within it receive a debuff that deals chaos damage over time. Caustic ground does not poison and is therefore not affected by poison-related modifiers.

Skill functions and interactions

Caustic Arrow will explode either at the targeted location or on the first monster or obstacle it hits.
Multiple projectiles: firing additional projectiles can spread caustic ground over a wider area, but the damage over time from overlapping patches of caustic ground does not stack.
Piercing: piercing Caustic Arrow projectiles will spread caustic ground each time they hit and will receive the chaos damage bonus any time they impact an enemy.
Projectile damage: passive nodes and gems (such as Slower Projectiles Support) that increase projectile damage will increase both the damage on hit and the area of effect damage.
Concentrated Effect: Concentrated Effect Support decreases the size of the AoE and increase its damage. However, due to the nature of the skill and the wording of its modifiers, the damage increase will not appear on the tooltip.
Point Blank: Point Blank does not affect the damage from caustic ground; it only affects projectile attack damage.[2]
Iron Grip: The strength bonus from the Iron Grip keystone passive does not affect the damage from caustic ground because it is not considered an attack nor is it based on physical damage. The increased projectile damage portion of the Iron Grip Support will increase the damage from caustic ground, but the strength bonus the support gem shares with the keystone will not apply.
Accuracy: The projectile attack is subject to accuracy and can miss. However, the explosion will spread caustic ground and do damage regardless of whether the projectile attack hits or misses. Piercing Caustic Arrow will not spread caustic ground if it misses.
Duration: modifiers to duration will affect the duration of the caustic ground.
Culling strike: The increased damage from Culling Strike Support applies to the damage from caustic ground, but the caustic ground will not kill enemies instantly when they have less than 10% life.
Curses: Sniper's Mark requires the target to be hit. The caustic ground won't be affected by it.Despair does affect the caustic ground.

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