Dimmer of Light

These horrifying creatures hail from jungles in the depths of Tartarus, though prides of them are sometimes encountered in the mortal world. With the head and long neck of a serpent, and the body of an enormous great cat (males) or a claw-footed elephant (females), they make terrifying predators. Occasionally they are used as mounts by the generals and princes of the underworld. When so used they are typically given full plate barding, increasing their AC to 31 and reducing their movement to 30 ft.

Dimmer of Light CR 13
CE huge outsider
Init: +2 Senses: darkvision 90'
Listen +19 Spot +19

AC: 22 (-2 size, +2 Dex, +12 natural), touch 12, flat-footed 20.
HP: 133 (HD 14d8+70)
Resistances: fire 15, acid 10
Immunities: poison
Fort: +14 Reflex: +13 Will: +13

MV: 40 ft.
Attack: bite +22 (1d6+10 plus poison)
Full Attack: bite +22 (1d8 + 10 plus wisdom damage) and 2 claws +20 (2d4 + 5)
Face / Reach: 15ft / 10ft
Base Attack: +12 Grp: +30

Abilities: Str: 31 Dex: 15 Con: 20 Int: 6 Wis: 14 Cha: 11
Feats: weapon focus bite, multiattack, improved natural attack (bite), lightning reflexes, iron will
Skills: Balance +19, Climb +27, Jump +27, Hide +11, Listen +19, Move Silently +11, Spot +19, Swim +27

Wisdom Damage (Su): The bite of these creatures damages the sanity of those bitten. A DC 22 fort save is required to resist 1d10 points of wisdom damage. Those reduced to 0 Wisdom by these attacks fall unconscious.