Keen Hearing and Smelling. The zosinine has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The zosinine has advantage on an attack roll against a creature if at least one of the zosinine's allies is within 5 feet of the creature and the ally isn't incapacitated.

Ambush Predator. If the zosinine surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 7 (2d6) damage from the attack.

Multiattack. The zosinine makes two attacks: one with its bite and one with its claws.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage, and the target must make a DC 13 Constitution saving throw, taking 7 (2d6) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 3) slashing damage