The Infestation dwelling within Nidus mutates rapidly when used against his foes, fueling his abilities and yielding various symbiotic benefits. Nidus possesses various passive mechanics highlighted in the tabs below: |-|Mutation Stacks = Mutation is a resource unique to Nidus, indicated by its counter and gauge displayed in the lower-right on the HUD, above the ability icons. |-| Undying = If Nidus suffers fatal damage with at least 15 stacks of Mutation, those 15 stacks are consumed, granting him 5 seconds of invulnerability and restoring health to 50%.