Multiattack

The grimmlet swarm makes two attacks with its crystal edges.

Crystal Edges

Melee Weapon Attack: +8 to hit, reach 0 ft., one creature in the swarm's space. Hit: 18 (4d8) slashing damage, or 9 (2d8) slashing damage if the swarm has half of its hp or fewer. The target must make a DC 17 Intelligence saving throw, taking 21 (6d6) psychic damage on a failed save, or half as much damage on a successful one.