Pack Tactics. The concavenator has advantage on an attack roll against a creature if at least one of the concavenator's allies is within 5 feet of the creature and the ally isn't incapacitated.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 7 (2d6) acid damage. Rend. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 2 (1d4) piercing damage and the target must succeed on a DC 13 Dexterity saving throw or have their armor class reduced by 1, up to a minimum of 5. AC lost in this way are restored after a short or long rest. Tail Swipe. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 3 (1d6 + 3) bludgeoning damage. If the target is a creature, it cannot make opportunity attacks until the end of its next turn.