Brachyurus (CR 23)

Large Magical Beast
Alignment: Any
Initiative: +18 (+14 Dex, +4 Improved Initiative); Senses: Blindsight 240 ft., darkvision 60 ft.,low-light vision, scent, Listen +33, and Spot +35
Languages: Common, can communicate with all wolves

AC: 40 (+14 Dex, -1 size, +17 natural) touch 23, flat-footed 26
Hit Dice: 38d10+684 (893 hp); DR: 10/epic
Fort +41, Ref +37, Will +25
Speed: 80 ft.
Space: 5 ft. by 10 ft./10 ft.
Base Attack +38; Grapple +52
Attack: 2 claws +48 melee, 1 bite +46 melee
Damage: Claw 2d6+10/19-20, bite 3d6+5/19-20
Special Attacks/Actions: Frightful howl, savage 15d6+25
Attack Options: Improved Trip, savage
Abilities: Str 30, Dex 38, Con 47, Int 18, Wis 32, Cha 19
Special Qualities: fast healing 10, SR 32, scent, acid, cold, electricity, fire, and sonic resistance 20
Feats: Alertness, Blinding Speed (X2), Great Fortitude, Improved Bull Rush, Improved Critical (claw), Improved Critical (bite), Improved Initiative, Improved Trip, Iron Will, Lightning Reflexes, Multiattack, Weapon Focus (claw), Weapon Focus (bite)
Skills: Hide +20, Listen +33, Move Silently +34, and Spot +35
Advancement: 39-48 HD (Large); 49-58 HD (Huge); 59-66 HD (Gargantuan); 67-135 HD (Colossal)
Climate/Terrain: Usually lawful neutral
Organization: Solitary, pair, or pack (5-10)
Treasure/Possessions: Standard

Source: Lost Empires of Faerûn

Frightful Howl (Su): As a standard action, a brachyurus can emit a howl in a 60-foot-radius spread that affects opponents with fewer Hit Dice or levels than the brachyurus has. The affected creature must make a successful Will save (DC 33) or become shaken. Success indicates that the target is immune to that brachyurus's frightful howl for one day.

Savage (Ex): If a brachyurus successfully trips an opponent, it latches onto the opponent's body and tears the flesh. This attack automatically deals an additional 15d6+25 points of damage. If an opponent goes prone for any reason (perhaps the subject of another brachyurus's Improved Trip attack) in an area a brachyurus threatens, the brachyurus can also savage the victim as a free action (treat as the brachyurus's attack of opportunity for the round), even though it had nothing to do with tripping the foe.