Arcane Finale

You dig into the deepest reserves of your magic for an attack that grows in power the less magical power you have left. Make a ranged spell attack against a creature within range. On a hit, the target takes 2d10 force damage.

If the spell slot used to cast this spell is the last available slot of its level, it deals an additional 1d10 force damage. If the spell slot used to cast this spell is the last spell slot available to the caster, it instead deals an additional 2d10 damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the spell's base damage increases by 1d10 for each slot level above 2nd.