Corpse Explosion of the Corpse of the Boss Tilts me. I Swear Lol.

Killed boss. Exited to Sell cuz inventory was full. Came back in. The moment I started to walk, Boom! Bye bye hp.

And then I hear krip's voice goin thru my head saying he Corpse exploded the corpse of the boss...interesting day today bros.

What boss is this? I cant tell with the potato graphics.