Adelhaide, "The Philanthropic"

Greed of the Philanthropic. Adelhaide has a 50/50 chance to siphon the hit points of a target for half the damage dealt to them.

Demonic Haymaker. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 8 (2d6 + 5) Bludgeoning damage.

Demonic Roundhouse. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 8 (2d6 + 5) Bludgeoning damage.

Impaling Kick. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 15 (2d12 + 5) Bludgeoning damage. Constitution Saving Throw: DC 14, On Fail: Creature is knocked prone. On Success: Half Damage.

Skull Caver. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 12 (3d6 + 5) Bludgeoning damage. Strength Saving Throw: DC 16, Failure: The creature is knocked prone until their next turn. Success: Half Damage.

Spear Thrust. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 30 (10d6 +10) Piercing damage. 50/50 Chance for Grappled effect.

Warhammer Crash. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 45 (8d12 + 25) Bludgeoning damage, the creature is knocked prone. 

Spear Throw. Ranged Weapon Attack: +4 to hit, range 60/120 ft., 1 target. Hit: 10 (1d100 + 5) Piercing damage. If the attack does 50+ damage, the target is Grappled/Pinned.

Soul Siphon. Absorb the life force of a grappled/prone creature. Damage done by Soul Siphon is directly converted into Hit Points. (5d10) Necrotic Damage.

Phantasmal Shift. Teleport yourself out of the way of an incoming attack, appearing within 5 ft. of another creature.

Legendary Action Uses: 3. Immediately after another creature’s turn, Keshta can expend a use to take one of the following actions.

Crimson Borealis Cost: (3). Adelhaide raises her arm into the air and channels the power of the nether realm to siphon the blood and soul of every creature on the battlefield and uses it to restore herself. Each individual creature has 50% of their remainder health siphoned off and turned into a sphere of demonic energy.
 If the creatures do not deal 150+ damage to Adelhaide before her next turn, she absorbs the demonic energy to replenish her health. If the creatures are able to disrupt Adelhaide, the siphoned hit points are returned to every creature and Adelhaide takes damage equal to the hit points gathered.