Champion of Heresy, Ruler of the Sixth Circle of Hell

Fire Incarnate:  The Champion of Heresy's body is encased in a violent hellfire. This hellfire bypasses any type of fire resistance, and makes any immune creatures take half damage. 

The Champion of Heresy takes three (3) attacks; two (2) with its claws and one (1) with its hellfire chain. 

Claws (2): Melee Weapon Attack: +10 to hit, 5 ft. reach. 2d8+4 piercing damage plus 2d10 fire damage. 

Hellfire Chain (1): Weapon Attack: +10 to hit, 15 ft. reach. 2d8+3 slashing damage plus 2d10 fire damage. 

Hellfire Breath (recharge 4-6):  The Champion of Heresy spews hellfire flame breath in a 30-foot cone. every creature within that range must make a DC 16 dexterity saving throw, taking 12d8 fire damage on a fail and half of that on a save. This hellfire bypasses all resistances and makes immune creatures take half.