Blazing srike

Your arms are ingulfed in golden flames for the duration of the spell, when you make an unarmed strike while the spell is active you add your spellcasting modifier to the roll, on hit the attack does 3d10 fire damage to the target and creates a 5ft cone springing forth from the target, everyone caught in the cone must make a dexterity saving throw, taking 3d6 fire damage on a failed throw and half as much on a successful one. You can only use this spell's effects once per turn.

At Higher Levels. When you cast this spell using a spell slot of 4nd level or higher, the damage increases by 1d10 and 1d6 for each slot level above 3rd.