Extremely Effective Mousetrap

Origins
The origins of this artifact are unknown. It was collected from a salesman who guaranteed it to "kill 100% of all mice, rats and other vermin, without fail."

When questioned he claimed to have recovered it from a building explosion during WWII.

Effects
When the trap snaps shut, it releases a small explosion on par with a hand grenade. The trap is always unharmed and can be reset for repeat uses.