Writhing Remains

The Writhing Remains is a pet item dropped by Eater of Worlds in Master mode. It summons a pet Eater of Worms. The Writhing Remains has a chance of being dropped. It acts similar to The Destroyer-Lite, which is the Master mode pet of The Destroyer.

Trivia
The buff tooltip "May ruin several backyards" could possibly be a reference to worms digging many holes in backyards.