Multiattack

The wormhearted suffragan can make two helminth infestation attacks, or it can cast one spell and make one helminth infestation attack.

Helminth Infestation

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (2d6) bludgeoning damage plus 10 (3d6) necrotic damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw or be afflicted with a helminth infestation (parasitic worms). An afflicted creature can't regain hit points and its hit point maximum decreases by 10 (3d6) for every 24 hours that elapse. If the affliction reduces the target's hit point maximum to 0, the victim dies. The affliction lasts until removed by any magic that cures disease.