Guardian Monster: Abomination Guard Monster is made for Guarding, thanks to that it have advantage on perception rolls and have really good sight.

Frightful roar: Abomination Guard Monster can let lose a Frightful roar that will rattle every bone in your body, anybody in radius must make CON save (DC 15) or become frightened.

Multiattack: Abomination Guard Monster can aattack with its mouth tentacles 2 times or with its claws 2 times.

Tentacles. Melee Weapon Attack: +8 to hit, reach 10 ft., 1 target. Hit: 15  (2d10 + 5) Slashing damage + 4d8 acid damage.

Claws. MelleWeapon Attack: +8 to hit, range 5 ft., 1 target. Hit: 17 (3d8 + 5) Slashing damage + CON. save (DC 15), i fail take 2d8 poison damage and is posioned, on success take half and is not poisoned.