rare ne medium beast 

Perception +17; darkvision

Languages Abyssal, Aklo, Common, Infernal, Undercommon

Skills Arcana +25, Athletics +17, Intimidation +19, Stealth +20

Str +3 Dex +6 Con +6 Int +7 Wis +3 Cha +3

Items scroll of dimensional anchor, scroll of fly

AC  28; Fort +22, Ref +20, Will +21

HP 180

Instant Suspension [R] Trigger The quintessivore reduces a creature within 15 feet of it to 0 Hit Points; Effect The quintessivore uses Suspend Soul, targeting the creature.

Speed 40 feet, climb 20 feet

Melee [>] blade-leg +22 (finesse, magical), Damage 1d10+9 slashing damage plus 1d10 negative damage and tattered soul

Arcane Prepared Spells DC 29, attack +21; 5th black tentacles, grim tendrils, passwall; 4th clairvoyance, enervation (×2); 3rd slow, vampiric touch (×2); 2nd comprehend language, see invisibility, web; 1st feather fall, fleet step, ray of enfeeblement; Cantrips (5th) daze, detect magic, mage hand, ray of frost, read aura

Feed on Quintessence (arcane, exploration, manipulate, necromancy) Over the course of 1 hour, the quintessivore removes and deconstructs the soul of a creature. The creature must either be captive or have been dead for no more than 2 hours before the start of the process. At the end of the hour, the quintessivore consumes the quintessence of the creature's soul. For the next month, it gains a +1 status bonus to its spell DC and spell attack roll, and it adds 6th-level feeblemind and vampiric exsanguination to its arcane prepared spells. Deconstructing a soul maps the unique properties of the creature's soul into the quintessivore's blade-legs. The soul can be reconstructed by binding it to quintessence. A dead quintessivore's soul flees its body as pure quintessence suitable for this purpose.

Suspend Soul [>] (arcane, necromancy) The quintessivore suspends the life processes of a dying creature within 15 feet of it. The creature can't decrease or increase its HP or dying value for 10 minutes. The creature can attempt a DC 29 Will save to avoid this effect. If the creature receives magical healing, it can attempt a new save, ending the effect and being healed normally on a success. The effect ends if the quintessivore uses Suspend Soul again.

Tattered Soul A creature hit by the quintessivore's blade-leg Strike must succeed at a DC 29 Fortitude save or become drained 1 (drained 2 on a critical failure). If the creature is already drained, it's immune to this effect.

Bestiary 3, page 209.