Swarm of Corpse Worms

Actions

Bites. Melee Weapon Attack: +2 to hit, reach 0 ft., one creature in the swarm's space. Hit: 20 (4d8) piercing damage, or 10 (2d8) piercing damage if the swarm has half of its hit points or fewer.   Black Tentacles The swarm manifests the spell Black Tentacles around itself or their foe. (With a Range of 90 feet.)   Drive Corpse The swarm can enter into a corpse and animate it in 1d4 (an extra 1d4 added on for every size category above Small) turns as a Hollowed Carrier, though it can only animate the corpse in such a way if threatened or no other corpses are nearby. (If left like this for a week will become a Bloated Hollowed Carrier and the swarm returns to full size)

A swarm of necrotic magical insects that feed off the corpses of the dead with a preference for fresh carcasses that normally resides within planes of existence where rivers of blood are common, using such as their primary home when corpses aren’t available. In the wilds of other planes swarms of corpse worms congregate in the bodies of massive creatures, and when the corpse is running out of room they begin to seek out new bodies to latch unto in their search for a sustainable food source.   They appear like long eels whose somewhat beak-like face splits into four jaws, each featuring rows upon rows of prehensile teeth. Each segment of their face features three thick waxy eyes with a human-like iris that switches into an "X" shape when exposed to blood, allowing them to see through the blood as if air.   The hide of corpse worms come in many colors, but most common are a pale blue-green with a darkened face or a reddened burnt-black. Several of their kind feature specific additional features such as slashes of white along their back or blood red bellies and pale spots down their sides.   https://www.dandwiki.com/wiki/Swarm_of_Corpse_Worms_(5e_Creature)