Assassin drake

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

Sneak Attack (1/Turn). The drake deals an extra 4 (1d6) damage when it hits a target with a melee attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the drake that isn't incapacitated and the drake doesn't have disadvantage on the attack roll.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) [piercing] damage + 4 (1d6) [acid] damage

Acidic spit. RangedWeapon Attack: +5 to hit, range 30/60 ft., one target. Hit: 10 (2d6 + 3) [acid] damage.