Blackheart Horror

Duplicating Horror. When the Blackheart Horror dies it duplicates into 1d6 Emberbrain Horror.

Spellcasting. The Blackheart Horror is a 5th level spellcaster. Its spellcasting ability is Wisdom (spell save DC 16, +5 to hit with spell attacks). The Blackheart Horror has following Sorcerer  spells prepared:

Cantrips (at will): Firebolt, Acid Splash 

1st level (4 slots): Magic Missile, Mage Armor, Disguise Self

2nd level (3 slots): Scorching Ray, Invisibility, Hold Person

3rd level (2 slots): Summon Horror, Fireball

Ring of Fire: The horror picks a point within 60 feet of it and from that point erupts a ring of fire that is 30 feet wide. Any creature within the ring when it is summoned or starts its turn in the ring must make a DC Constitution saving throw of 16 or take 4d6 fire damage or half as much on a successful save. 

Multi-Attack. The Horror makes six claw attacks or 3 fire sling attacks.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 5 (1d8+2) Slashing damage.

Fire Sling. Ranged Weapon Attack: +4 to hit, range 15/60 ft., 1 target. Hit: 9 (1d12+2) Fire damage.