Volcanic Endurance

The target gains 2d4 + 4 Temporary Hit Points against the attack. Any remaining hit points at the start of the target's next turn convert to healing if they are missing any Hit Points, or dissapear.

Using a Higher-Level Spell Slot. You gain 1d4+2 additional Temporary Hit Points for each spell slot level above 1. Beginning at 11th Level, you may add your spellcasting bonus.