Beedrill (5e Creature)
From D&D Wiki
Medium monstrosity, any alignment
Sniper. When the beedrill scores a critical hit, it rolls triple the damage die instead of the usual double.
Swarm. While it has 30 hit points or fewer, the beedrill has advantage on attack rolls. In addition, it deals an extra 7 (2d6) damage to any target it hits with a melee attack.
Multiattack. The beedrill makes two twineedle attacks.
Twineedle. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage plus 7 (2d6) poison damage.
Drill Run. The beedrill moves up to twice its speed in a straight line, including through other creature's space. Each creature whose space it moves through must make a DC 14 Dexterity saving throw. A creature takes 18 (4d6 + 4) piercing damage plus 7 (2d6) poison damage on a failed save, or half as much on a successful one.