Vanyver
CREATURE 13Vanyvers are large, humanoid bats shaped from void and shadowstuff, their red eyes glowing like tiny stars in an otherwise lightless night. Though powerful, they're the least of the darvakkas, and the most likely to submit to a master, either another of their kind or a mortal with a reputation for being especially murderous and destructive. Vanyvers agree to follow their masters as a temporary means of maximizing the death and destruction they can enact but will quickly turn on any master they feel falters in this goal.
Darvakkas, also called nightshades, are a ravenous evil made up of equal parts darkness and malice. Originally creatures of the Outer Planes who travel to the convergence of the Shadow Plane and the Void—where the power of nothingness obliterates them—these undead abominations are the physical embodiment of entropy. They burn with an intense hatred for all life, working to bring a final, dark night to the Material Plane where nothing but ash and ice remain.
As creatures twisted by darkness and shadow, darvakkas have a great aversion to sunlight and all sources of vitality energy. On the Material Plane, they spend the hours of daylight hidden below ground, amid ruins, or submerged deep in the ocean's darkest chasms beyond the reach of the sun's rays, emerging when darkness shelters them overhead.
Darvakkas have an aura of entropy that attracts undead thralls to serve as warriors and heralds. They rarely seek alliances with each other or other creatures, existing in solitude as the heads of individual armies of the dead.
A creature with greater darkvision can see perfectly well in areas of darkness and dim light, though such vision is in black and white only. A creature with greater darkvision can see through even forms of magical darkness.
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.
Lifesense allows a monster to sense the vital essence of living and undead creatures within the listed range. The sense can distinguish between the vitality energy animating living creatures and the void energy animating undead creatures, much as sight distinguishes colors.
40 feet. Vanyvers leak entropy and corruption from their very being. A living creature entering or starting its turn in the aura takes 3d6 void damage with a DC 30 basic Fortitude. If it fails, it's also Enfeebled 1 for 1 minute and pulled 10 feet toward the vanyver.
The vanyver can Fly at half Speed while they have a creature Grabbed or Restrained in either or both of their talons, carrying that creature along with them.
A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.
3d10+5 piercing DC 33 basic 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.
The monster can instead use Grab and choose one creature it's grabbing or restraining with an appendage that has Grab to automatically extend that condition to the end of the monster's next turn.