Edema

Edema is an immobile enemy found in The End chapter. With 8 HP, 0 damage, and 0 movement, it poses no direct threat: it cannot move, it cannot attack, and it simply sits on the battlefield as a swollen, inert mass. However, time is not on your side. Edema has a built-in countdown timer, and when that timer reaches zero, it evolves into a Husk, a far more dangerous enemy that can actively fight and kill your cats.

Killing an Edema before it transforms is the obvious answer, but it comes with a cost: when destroyed, it spawns Thorny tumors as a parting hazard, littering the area around its corpse with damaging obstacles. This creates a tactical dilemma: do you kill the Edema early and deal with Thorny tumors cluttering the battlefield, or do you leave it and risk facing a Husk? In encounters with multiple Edemas, the calculus shifts further as unchecked transformations can overwhelm your party.

The best approach is to kill Edemas when your cats have room to maneuver around the resulting Thorny tumors. Ranged attacks let you eliminate them without standing in the tumor spawn zone. Champion Edemas have 16 HP but the same zero movement and damage, simply providing more time to transform rather than more threat. Edema is based on an enemy of the same name from Edmund McMillen's The End is Nigh.