Artificer explosive

As an action, an artificer can use 1 charge of magical tinkering to imbue this item with explosive magics and either throw it 20 feet or stick it to a flat surface. At the end of the creature who activated the bomb's turn, the bomb explodes, and all creatures within 10 feet of it must make a DC 15 dexterity saving throw, taking 2d12 force damage on a failed save and half as much damage on a successful one. Creatures who fail the save also take 1d8 fire damage and 1d4 piercing damage (from the shrapnel). The explosion can bust through 30 feet of stone and 20 feet of steel. Once the bomb explodes, it cannot be used again (obviously).