Vaal side area

A Vaal side area or corrupted area is a randomly-generated side area indicated by a glowing, beating heart and swirling ribbons of blood. Every corrupted area contains a boss, guarding a Vaal Vessel that drops Vaal Skill Gems, Vaal Fragments, and corrupted equipment. One Vaal skill gem is guaranteed to drop. Near the vessel there is a Vaal Letter or Research Journal, which provides Vaal-related lore.

Corrupted areas have modifiers, similar to end-game Maps, which substantially increase their difficulty. Since corrupted items cannot be modified, the modifiers cannot be rerolled. Corrupted areas found in act zones spawn have 1 to 2 affixes (magic), while corrupted areas found in maps spawn with 4 to 6 affixes (rare).

Due to the small size of corrupted areas, league mechanics are generally disabled from spawning in corrupted areas during challenge leagues. Masters, more corrupted areas and Trials of Ascendancy also cannot spawn in corrupted areas. Notable exceptions which CAN spawn in them include Silver Coins, Strongboxes, Shrines, Rogue exiles and Tormented Spirits. Many of the corrupted area bosses were also formerly Invasion bosses.

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