Azazel's Mana Burn

As you speak the command word "Ignîtus". The magic in your blood begins to burn, causing an additional 2d10 fire damage through all magical attacks made by you. This damage increases by 1d10 for every higher level spell slot used.

Casting this at 5th level or higher causes a point of exhaustion when the spell ends, starting at 5th level your touch does 3d6 fire damage. This damge increases 1d6 for every higher lever spell slot used.

Casting this spell at 9th level causes your body to burst into flames, creating a 15 ft. Radius around you where all creatures must make a con saving throw. On a failed saving throw the creatures take 5d10 fire damage instanly and when they end their turn in the radius of effect. On a successful saving throw the creature takes half damage. You must take a short rest after casting this at 9th level.