Blood Abomination

Shapechanger. The blood abomination appears as whatever form the creature's blood used in creating it came from. Its statistics are also the same as whatever creature's blood created it, and if more than one creature's blood was used, the blood abomination has the average score of each involved creature.

Multiattack. The blood abomination makes two melee attacks.

Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d10 + STR) bludgeoning damage.

Blood Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (1d12 + DEX)

Read Thoughts. The blood abomination magically reads the surface thoughts of one creature within 60 feet of it that it shares blood with. The effect can penetrate barriers, but 3 feet of wood or dirt, 2 feet of stone, 2 inches of metal, or a thin sheet of lead blocks it. While the target is in range, the doppelganger can continue reading its thoughts, as long as the blood abomination's concentration isn't broken (as if concentrating on a spell). While reading the target's mind, the blood abomination has advantage on Wisdom (Insight) and Charisma (Deception, Intimidation, and Persuasion) checks against the target.