Last Resort (5e Equipment)

Weapon (Hunting Rifle), rare

This magical rifle is a prototype weapon used to destroy whoever stands in your path with arcane destruction.

Last Resort: you can use an action to fire a blast of radiant magical energy from its barrel. All creatures in a 5 feet by 100-foot line must make a DC 15 Dexterity saving throw. On a failed save, a creature takes 5d8 radiant damage, or half as much on a success.

Unstable prototype: Whenever you use the Last Resort property, roll a d6. On a 1, the rifle explodes, causing 10d8 radiant damage to the wielder. A successful DC 15 Dexterity saving throw halves that damage.