Blood Queen's Wrath

Grand Sacrifice. This creature can only be summoned by performing the Grand Sacrifice Blood Ritual by a Blood Witch.

Blood Rain. Clouds gather above a 120ft area above the Blood Queen's Wrath, and it begins raining blood. Any enemy inside the area at the end of their turn must make a DC 13 Constitution saving throw or Suffer 1d6+3 Necrotic damage. All allies within range Restore 1d6+3 hit points.

Undulation. If the Blood Elemental is healed past its maximum hit points, it receives a temporary hit point for each point healed over its maximum. All allies and enemies also receive these temporary hit points.

Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 13 (2d8 + 4) bludgeoning damage. 

Draining Blood Bolt. RangedWeapon Attack: +7 to hit, range 5/60 ft., 1 target. Hit: 20 (4d8 + 5) necrotic damage. The Blood Queen's Wrath restores hit points equal to half of damage dealt.

Blood Transfusion. (Once per combat encounter; 1 reaction) Blood begins to pool around all allies and enemies and the Blood Queen's Wrath hungers for it. The Blood Queen's Wrath's hit points become equal to the highest amount of all allies and enemies. Then, the hit points of all allies and enemies become equal to that amount. 

Blood Empowerment. (Three times per combat encounter; 1 action) The Blood Queen enforces her will by empowering her Wrath's next draining bolt to hit 2 additional targets.