Nightmare, Cauchemar (CR 11)

Huge Outsider (Evil and Extraplanar)
Alignment: Always neutral evil
Initiative: +6 (+2 Dex, +4 Improved Initiative); Senses: darkvision 60 ft., Listen +21, and Spot +21


AC: 26 (-2 size, +2 Dex, +16 natural), touch 10, flat-footed 24
Hit Dice: 15d8+105 (172 hp)
Fort +16, Ref +11, Will +10
Speed: 40 ft., fly 90 ft. (good)
Space: 15 ft./10 ft.
Base Attack +15; Grapple +33
Attack: Hoof +23 melee
Full Attack: 2 hooves +23 melee and bite +18 melee
Damage: Hoof 2d6+10 and 1d4 fire, bite 2d6+5
Special Attacks/Actions: Flaming hooves, smoke
Abilities: Str 31, Dex 14, Con 24, Int 16, Wis 12, Cha 12
Special Qualities: Astral projection, etherealness
Feats: Alertness; Improved Initiative; Power Attack; Run
Skills: Bluff +19, Concentration +25, Diplomacy +5, Disguise +1 (+3 acting), Intimidate +21, Knowledge (arcana +21), Knowledge (the Planes) +21, Listen +21, Move Silently +20, Search +21, Sense Motive +19, Spot +21, and Survival +19 (+21 on other planes and following tracks)
Advancement: -
Climate/Terrain: Gray Wastes of Hades
Organization: Solitary
Treasure: None

Source: Monster Manual