Magma Aegis

You manifest a shield of magma around yourself, shedding dim light within 5 feet and gaining 7d6 temporary hit points for the duration of the spell. A creature that makes a melee attack against you must make a Constitution saving throw. On a failure, it takes 5d6 fire damage, causing the aegis to explode and ending the spell.

At Higher Levels. When you cast this spell by spending Mana points equal to a 5th-level spell or higher, the temporary hit points increase by 2d6 and the damage increases by 1d6 for each spell level above 4th. When cast as a 5th-level spell or higher, this spell’s damage becomes incinerating.