Bob-omb

Wind-up, suicide bombers that first appeared in the NES (Nintendo Entertainment System) video game Super Mario Brothers 2.

ABILITIES:
Touching a Bob-omb, intentionally or not, triggers its self-destruct mechanism. After a brief countdown, the resulting small-scale, localized explosion will destroy anything within a five-foot radius of the Bob-omb. This mechanical bomber can operate for about twenty-four hours before its spring needs to be wound again.

WEAKNESSES:
Once a Bob-omb starts the detonation process, it cannot move. This gives whomever set the clockwork saboteur off a chance to escape the blast if they're quick. If a Bob-omb's spring winds all the way down, it becomes inert and harmless until someone winds it up again.