Aggram's Rage

You summon forth the spirit of the fire giant Aggram. When summoned a raging firestorm erupts in the area 15 feet around you. When you cast this spell, you can designate any number of creatures you can see to be unaffected by it. While this spell remains you are immune to fire damage and cannot be knocked prone. An affected creature if it is a medium size or smaller must attack you if able. When a creature enters the area for the first time on a turn or starts its turn there, it must make a Strength saving throw. On a failed save, the creature takes 3d8 fire damage on a successful save, the creature takes half as much damage. On your turn you may use a bonus action to have Aggram enrage a target in the area, if you do the target must succeed a Wisdom saving throw or take 2d8 fire damage and enter a rage until your next turn. While the spell remains active you may make a Strength check to try and commune with the spirit of Aggram.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.