Spark stone

The Spark Stone was a magical item that, when crushed, granted its user a boon of +1d6 fire damage with hands, claws, or talons when activated. Before being crushed, the Spark Stone was an orb of blackened rock that had red veins of pulsing energy arcing through it like a bolt of lightning locked in a single moment in time. Keyleth crushed the stone during Vox Machina's fight against a Behir near Whitestone