Petal Slashes

Melee Weapon Attack: +6 to hit, 0 ft., one creature, in the swarm's space. 18 (4d8) slashing damage or 9 (2d8) slashing damage if the swarm has half its hp or fewer. Target must make a DC 13 Con save reducing its hp max by an amount equal to damage taken on a failed save or by half as much if made. This reduction lasts until creature finishes a long rest. Target dies if this reduces its hp max to 0.