pf2e.fyi
From Pathfinder #177: Burning Tundra, which isn't enabled.

Everburning Mammoth

CREATURE 8
RAREMEDIUMCHAOTICEVILUNDEADUNHOLY
Perception +16; darkvision
Languages Common, Hallit
Skills Acrobatics +17, Athletics +18, Stealth +17
Str +5, Dex +5, Con +4, Int +1, Wis +4, Cha +0
AC 26; Fort +16, Ref +17, Will +16
HP 135, void healing; Immunities bleed, death effects, disease, paralyzed, poison, unconscious
Spurred by Death
Trigger An ally within 30 feet reduces a creature to 0 HP
Effect The everburning mammoth uses Drink Blood on a creature that meets the ability's requirements.
Speed 30 feet
Melee Jaws +20 (finesse, unarmed), Damage 2d6+8 piercing plus Paralysis
Melee Claw +20 (agile, finesse, unarmed), Damage 2d6+6 slashing plus Grab
Drink Blood (divine)
Requirements A Grabbed, Paralyzed, Restrained, Unconscious, or willing creature is within the everburning mammoth's reach
Effect The everburning mammoth tears into the creature with its jaws and gorges itself on the victim's blood. This requires an Athletics check against the victim's Fortitude DC if the victim is grabbed and is automatic for any of the other conditions. The victim is Drained 1, and the everburning mammoth regains 15 healing HP, gaining any excess HP as temporary Hit Points. Drinking Blood from a creature that's already drained doesn't restore any HP to the everburning mammoth but increases the victim's drain value by 1.
Paralysis (incapacitation, occult)

Any nonliving creature hit by the everburning mammoth's jaws Strike must succeed at a DC 23 Fortitude save or become Paralyzed. It can attempt a new save at the end of each of its turns, and the DC cumulatively decreases by 1 on each such save.

Pathfinder #177: Burning TundraOGL