Upon defeating both Nibs and Chubs standalone head spawns burst of bouncing tears similar to Monstro's Lung.
Nibs
While Cadavra isn't connect to it, it throws 3 Small Maggots at Isaac
While Cadavra is connected, it can do one of following attacks:
Nibs connect to random wall via umbiblical cord and moves to it, spawning 5 projectiles at pentagon directions. Upon reaching wall, it shot 5 projectiles at Isaac.
Spawn 3-4 clusters containing 4-5 tears, which bounces from wall
After disconnection, Nibs spawn bunch of tears in clockwise pattern
Chubs
While Cadavra isn't connect to it, it spawns 3 Red Flies
While Cadavra is connected, she jumps to Isaac and spawns tears around her and occasional shockwaves
After disconnection, Chubs spawn 3 Ipecac shots in triangle directions
Corpse.