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 Deactivated Probe, 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.