Dissonate Whispers. The mouths on the abomination's body are constantly murmuring dark secrets. Any creature that starts its turn with 15 feet of an abomination or enters the area for the first time on a turn must make a DC 22 Intelligence saving throw or be charmed by Ghaunadaur for one minute. A charmed creature treats Ghaunadaur as a trusted ally and will fight to protect him. An affected creature may attempt the same saving throw to resist the effects at the beginning of its turns.

Grasping Tendrils. The abomination can have up to six tendrils at a time. Each tendril can be attacked (AC 20; 10 hit points; immunity to poison and psychic damage). Destroying a tendril deals no damage to the abomination, which can extrude a replacement tendril on its next turn. A tendril can also be broken if a creature takes an action and succeeds on a DC 15 Strength check against it.

Spider Climb. The abomination can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Multiattack. The abomination makes four attacks with its tendrils, uses Reel, and makes one attack with its bite.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 22 (4d8 + 4) piercing damage.

Tendril. Melee Weapon Attack: +7 to hit, reach 50 ft., one creature. Hit: The target is grappled (escape DC 15). Until the grapple ends, the target is restrained and has disadvantage on Strength checks and Strength saving throws, and the abomination can't use the same tendril on another target.

Reel. The abomination pulls each creature grappled by it up to 25 feet straight toward it.