Copycat (Catterpede)

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

Rallying Blood. When the copycat dies, it releases chemicals contained within its blood that alerts all other copycats in a one-mile radius, granting each copycat 1d4 extra piercing damage on their bite attacks. This bonus stacks for each additional dead copycat.

Multiattack. The copycat makes two bite attacks on each of its turns.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 11 (2d6 + 4) piercing damage, and the target must succeed on a DC 16 Constitution saving throw or take 10 (3d6) poison damage. 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.