Contagion

Contagion is a chaos spell that applies a chaos damage over time effect to all enemies in the area, and spreads itself when an enemy dies. Contagion interacts favourably with, a skill that deals heavy chaos damage over time and is spread by Contagion.

Skill functions and interactions

 * Modifiers to spell damage only affect the damage over time effect of Contagion granted by the gem and do not affect other sources of damage over time caused by the skill.
 * : When an enemy affected by both Contagion and Essence Drain dies, the resulting Contagion proc will spread both effects. This is a unique interaction. Contagion will not spread other damage over time effects.
 * Duration: Increases and reductions to duration function normally. The duration of Contagion and associated degeneration effects is not reset when spread to other enemies on death.


 * Area of Effect: Modifiers to area of effect affect both the skill radius and spread radius of Contagion. Modifiers to area damage (such as ) do not apply.


 * On hit effects: Contagion does not hit, and therefore cannot activate the effects of supports such as.

Version history

 * Now has a base radius of 17 (from 20).


 * Now has alternative quality.


 * No longer gains additional radius as the gem levels (previously gained +4 radius by gem level 20).


 * Mana Cost at gem level 1 is now 5 (was 11).
 * Mana Cost at gem level 20 is now 20 (was 28).
 * Can now affect up to 40 targets per cast (from 20).


 * Contagion's radius has increased from 18 to 20 units.


 * Fixed an instance crash with Contagion.


 * Fixed an instance crash with [...] Contagion.


 * Fixed a bug where Contagion could be cast and spread through walls.


 * Contagion can now be supported by Iron Will.


 * Added to the game.
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