Blossoming Liberator

With a punch from your mechanical hand, you activate your emergency self-defense protocol. Make a melee spell attack against the target. On a hit, it takes 1d4 fire + 3d8 force damage. Roll a d20, on a 10 or lower, your hand completely shatters. This d20 roll does not count as a d20 test, so it cannot be altered in any way. You may fix the hand upon a long rest. Reloading the hand, given it is not currently destroyed, takes 1 minute and may not be done within combat. 

Cantrip Upgrade. The fire damage increases by 1d4 when you reach levels 5 (2d4), 11 (3d4), and 17 (4d4).