Ethereal Immolation

2nd-level evocation
Spell Lists: Artificer, Wizard
Casting Time: 1 Action
Range: 120 feet
Components: V, S
Duration: Concentration, up to 1 minute

You shroud a target in visible ethereal power that reacts violently to the presence of magic. For the duration of the spell, if the target casts a spell, it takes 1d12 force damage per level of spell slot spent (1d12 for cantrips). If the target ends their turn while concentrating on a spell, they take 1d4 force damage.