Shadow Stealth. While in dim light or darkness, Abomination Beta has advantage on Dexterity (Stealth) checks.

Multiattack. Abomination Beta makes four attacks: three with its claws and one with its spear.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Shade Spear. Ranged Weapon Attack: +11 to hit, reach 80 ft., one target. Hit: 23 (3d8 + 8) piercing damage. The spear magically returns to any open hand at the end of its turn.

Screech. Abomination Beta lets out a horrific screech. Each creature with 90 feet of it must succeed on a DC 16 Wisdom saving throw or be stunned. Any stunned creature can repeat the saving throw at the end of their turn, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this screech for the next 24 hours.