Keen Smell. Abyss has advantage on Wisdom (Perception) checks that rely on smell.

Protective. When a friendly creature within 60 feet of her takes damage from a hostile creature, she can use her reaction to move up to her speed towards the creature that made the attack and then make a bite attack. This movement does not provoke opportunity attacks.

Multiattack. If possible, Abyss uses her Drop. She then makes two attacks: one with her bite and one with her claws.

Drop. Melee Weapon Attack: +4 to hit, reach 5 ft, one target below Abyss. Hit: 7 (1d8 + 2) bludgeoning damage.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage.