accelerated F.O.P. (Fibrodysplasia ossificans progressiva)

You shoot a touch a creature, or its limbs. Make a ranged spell attack against the target. On a hit, the target takes 2d8 necrotic damage and has the petrified condition indefinitely because there muscles have been turned to bone.

Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 1.