Blood Witch

Blood Ritual. Using powerful blood magic, Blood Witches can conjure various creatures to do the bidding of their Blood Queen. By sacrificing 1d6 hit points, a blood witch can summon a Blood Leech (see Blood Leech). This creature obeys the commands of the witch.

Grand Sacrifice. When Blood Witches gather, the Blood Queen makes moves. At the end of a Blood Witches turn when in combat with at least two other Blood Witches if the Witches have sacrificed a collective 40 hit points, they immediately die and summon a Blood Queen's Wrath. 

Multiattack. The Blood Witch makes two claw attacks, or one claw and one blood bolt attack.

Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 10 (2d8 + 4) slashing damage. 

Blood Bolt. RangedWeapon Attack: +7 to hit, range 10/60 ft., 1 target. Hit: 18 (3d8 + 6) necrotic damage.

Upon death the Blood Witch explodes.  All creatures within a 20 foot radius of the Hag must make a DC 16 Dex Saving Throw.  On a failed save the creature(s) take 20 (3d10 +4) necrotic damage. On a successful save they take half as much.