Overbearing Pack. The xvart has advantage on Strength (Athletics) checks to shove a creature if at least one of the xvart's allies is within 5 feet of the target and the ally isn't incapacitated.

Raxivort's Tongue. The xvart can communicate with ordinary bats and rats, as well as giant bats and giant rats.

Sneak Attack (1/Turn). The xvart deals an extra 3 (1d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the xvart that isn't incapacitated and the xvart doesn't have disadvantage on the attack roll.

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

Sling. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.

Low Cunning. The xvart can take the Disengage action as a bonus action on each of its turns.