The Chaotic Puffer is an enemy that spawns in the 2nd and 3rd layers of the Abyss. It slowly swims towards the player and inflicts the Brimstone Flames debuff on contact, while periodically puffing up every 5 seconds. While it is unable to damage the player while not puffed, if it hits the player or dies while puffed up, it creates a large brimstone explosion, which also hurts other enemies. It receives increased knockback upon being hit.
- Though the Chaotic Puffer technically has 100% knockback resistance, it has a special interaction when hit by a projectile, which causes its velocity to get set to the projectile's velocity at the moment of impact. It will slowly drift to a stop afterwards.
- The Chaotic Puffer slowly rotates clockwise when moving to the right, and counterclockwise when moving to the left. It spins when hit.
- In previous versions of the mod, Chaotic Puffers only spawned in the final layer of the Abyss.