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Corrosion at scale. Contagion hits every enemy in a wide zone at once and applies the Contagious status, which turns each affected target into a small bomb when they die. Against dense waves, the chain of death explosions does more work than the initial spell.
Overview

How it plays

Corrosion at scale. Contagion hits every enemy in a wide zone at once and applies the Contagious status, which turns each affected target into a small bomb when they die. Against dense waves, the chain of death explosions does more work than the initial spell.

Strategy

Cast it into the middle of a pack and let the Contagious debuff multiply your damage. Clean up the weakened enemies fast to trigger as many explosions as possible before the debuff expires. Surcharge or Fireball into a Contagion-marked group is one of the more efficient burst windows in the game.

Strengths

  • Wide zone means it reliably hits multiple enemies per cast · Contagious death explosions scale with group size · Excellent synergy with burst spells from other schools

Weaknesses

  • Long cooldown requires careful timing · Death explosions require actually killing the debuffed targets