Spell Casting:

1st level (3 slots):Thunder Wave

Psychic Aura: All creatures, (except other abominations) within 15ft take 1d4 psychic damage at the start of the abomination's turn. (The damage can vary)

Death Burst: When the abomination dies, everyone within 30ft take 10 psychic  damage

Multiattack. The abomination makes two attacks.

Claw. Melee Weapon Attack: +6 to hit, Hit:  21 (5d6 + 5) [Slashing] damage. 

Crush. Melee Weapon Attack: +6 to hit, Hit:  14 (2d12 + 3) [Slashing] damage. And the target must succeed a DC 16 Strenth saving throw, or be knocked prone.

Throw: When a creature succeeds with a melee attack against the abomination, that creature is flung 20ft in a random direction.