uncommon ne huge beast 

Perception +27; darkvision, scent (precise) 100 feet

Languages Abyssal (Can't Speak Any Languages)

Skills Acrobatics +25, Athletics +31, Survival +27

Str +8 Dex +6 Con +4 Int -3 Wis +4 Cha -1

Ravenous Tracker A viskithrel can detect a creature's scent up to a week after the creature has passed through or left an area, and it gains a +4 circumstance bonus to Track a creature whose scent it has detected.

AC  37; Fort +25, Ref +27, Will +23

HP 275; Immunities sickened

Selective Scent A viskithrel's many-chambered snout allows it to partition and ignore scents. The creature can choose to critically succeed at any saving throw against an inhaled threat (such as inhaled poison) or olfactory effects, regardless of its roll.

Predator's Leap [R] Trigger A creature within 10 feet of the viskithrel makes a melee Strike against it; Effect The viskithrel Steps up to 15 feet, ignoring difficult terrain as it leaps over obstacles. If this movement takes the viskithrel out of range of the triggering Strike

the Strike is disrupted. It then makes a jaws Strike against a bleeding creature.

Speed 40 feet, swim 20 feet

Melee [>] jaws +30 (reach 15 feet), Damage 3d10+14 piercing plus 1d10 acid and Grab

Melee [>] talon +30 (agile, reach 10 feet), Damage 3d10+14 slashing

Melee [>] tentacle +30 (reach 20 feet), Damage 1d10+14 slashing plus 2d10 persistent bleed

and Grab [>] Melee talon +30 (agile, reach <10 feet>), Damage 3d10+14 slashing Melee [>] tentacle +30 (reach <20 feet>), Damage 1d10+14 slashing plus 2d10 persistent bleed.

Swallow Whole [>] (attack) Large, 3d10 bludgeoning plus 2d10 acid, Rupture 25.

Extinction Curse #6: The Apocalypse Prophet, page 84.