Wallmaster/Floormaster

The Wallmaster is a horrible creature that can, if it grabs you, send you back to the beginning of a level. Avoid it at all costs! It's brother, the Floormaster cannot send you back to the beginning of a level but (which hurt) splits into three seperate small Floormasters that drain Magic when they latch onto you.

Zelda 1, 2, 3, 5