Bdellavritra

A monster with telepathy can communicate mentally with any creatures within the listed radius, as long as they share a language. This doesn't give any special access to their thoughts, and communicates no more information than normal speech would.

The monster can cast its at-will spells any number of times without using up spell slots.

A constant spell affects the monster without the monster needing to cast it, and its duration is unlimited. If a constant spell gets counteracted, the monster can reactivate it by spending the normal spellcasting actions the spell requires.

(3d8+6) bludgeoning, DC 34 fortitude The monster deals the listed amount of damage to any number of creatures Grabbed or Restrained by it. Each of those creatures can attempt a basic Fortitude save with the listed DC.

Requirements The bdellavritra is possessing a host using Mind Worm

If the bdellavritra's next action is to Cast a Spell, they reduce the number of actions to cast it by 1 (minimum 1 action).

The bdellavritra spends 10 minutes adjacent to an Unconscious or willing living creature, then attempts to possess its body. This functions as Possession heightened to 9th rank (DC 37 will save), except that it has a duration of 1 month. If affected, the host receives new saving throws only at the start of each day. If the host dies, the bdellavritra must attempt a Fortitude save as normal but is only Stunned 2 on a failure (or Stunned 4 on a critical failure).

Requirements The bdellavritra isn't possessing a host

One of the bdellavritra's mouths sings to a living creature within 30 feet. Unless the target succeeds at a DC 37 will save (with a +4 circumstance bonus if the devil or their allies recently threatened the target), they can't use hostile actions against the bdellavritra for 1 round. The bdellavritra can Sustain this effect for up to 1 hour; each time they do, they can affect an additional target (maximum four targets). Each affected target can attempt a new saving throw to end the effect whenever they can't hear the bdellavritra for 1 round or the devil uses a hostile action against one of them.

Trigger The monster's last action was a successful Strike that lists Improved Grab in its damage entry, or the monster has a creature Grabbed or Restrained Effect If used after a Strike, the monster attempts to Grapple the creature using the body part it attacked with as a free action. This attempt neither applies nor counts toward the creature's multiple attack penalty. The monster can instead use Improved Grab as an action and choose one creature it's grabbing or restraining with an appendage that has Improved Grab to automatically extend that condition to the end of the monster's next turn.