Blacklance Bloodskin

Hellfire Pact. Through a dark pact, the bloodskin's weapon attacks are magical and deal an additional 1d6 fire damage on a hit (included in the attack). Also, whenever the bloodskin casts hellish rebuke, it deals an additional 1d10 damage. 

Spellcasting. The bloodskin is a 5th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 15, +7 to hit with spell attacks). The bloodskin has the following spells prepared:
Cantrips (at will): fire bolt, green flame blade, lightning lure, true strike
1st level (4 slots): cause fear, charm person, hellish rebuke 
2nd level (3 slots): aganazzar's scorcher, alter self, invisibility, scorching ray 
3rd level (2 slots): fear, fireball 

Multiattack. The bloodskin casts a cantrip and makes two greatsword attacks. 

Greatsword. Melee Weapon Attack: +8 to hit, reach 5 ft., 1 target. Hit: 11 (2d6 + 4) slashing damage and 3 (1d6) fire damage.