Legendary Resistance (2/Day). If the abomination fails a saving throw, it can choose to succeed instead.

Multiattack. The abomination makes two fist attacks and a tail attack. It can't make the tail attack against the same target as either of the fist attacks.

Fist. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit:  17 (2d10 + 6) bludgeoning damage.

Tail. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage.

Rock. Ranged Weapon Attack: +9 to hit, range 50/100 ft., one target. Hit: 30 (7d6 + 6) bludgeoning damage.

The abomination can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The abomination regains spent legendary actions at the start of its turn.

Conjure Animals. The abomination summons a fey spirit that take the form of a CR 1 or lower beast and appears in unoccupied spaces that it can see within range.

Beat Chest (Costs 2 actions). Each creature of the abomination's choice that is within 120 feet of the abomination and aware of it must succeed on a DC 17 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the abomination's Frightful Presence for the next 24 hours.