Mooncalf (CR 10)

Large Magical Beast
Alignment: Always neutral evil
Initiative: +7 (+3 Dex, +4 Improved Initiative); Senses: blindsight 100 ft., keen senses, Listen +25, and Spot +25
Languages: telepathy 100 ft.

AC: 25 (-1 size, +3 Dex, +13 natural), touch 12, flat-footed 22
Hit Dice: 15d10+108 (190 hp); DR: 10/magic
Fort +16, Ref +14, Will +12
Speed: 40 ft., fly 150 ft. (poor)
Space: 10 ft./10 ft. (30 ft. with tentacle rake)
Base Attack +15; Grapple +14
Attack: 2 tentacle rakes +18 melee and 6 tentacle-arms +13 melee
Full Attack: 2 tentacle rakes +18 melee and 6 tentacle-arms +13 melee
Damage: Tentacle rake 2d6+4/19-20, tentacle-arm 1d6+2
Special Attacks/Actions: Bite 2d8+6, improved grab, spell-like abilities
Abilities: Str 18, Dex 16, Con 24, Int 21, Wis 21, Cha 11
Special Qualities:
Feats: Alertness; Blind-fight; Combat Expertise; Improved Critical (tentacle rake); Improved Initiative; Improved Trip; Iron Will; Lightning Reflexes; Toughness
Skills: Concentration +25, Hide +17, Knowledge (arcana) +23, Knowledge (history) +23, Listen +25, Spellcraft +25, and Spot +25
Advancement: 19-27 HD (Huge); 28-60 HD (Colossal)
Climate/Terrain: Any hill or mountain
Organization: Solitary
Treasure/Possessions: Double standard

Source: Monster Manual II

Bite (Ex): With each successful grapple check, a mooncalf automatically hits a grabbed opponent with its bite attack, dealing 2d8+6 points of slashing damage.

Improved Grab (Ex): If a mooncalf hits an opponent that is its own size or smaller with a tentacle rake attack, it deals normal damage and attempts to start a grapple as a free action without provoking an attack of opportunity (grapple bonus +23). If it gets a hold, it automatically hits with its bite attack on the same round. Thereafter, the mooncalf has the option to conduct the grapple normally, or simply use its tentacle to hold the opponent (-20 penalty on grapple check, but the mooncalf is not considered grappled). In either case, each successful grapple check it makes during successive rounds automatically deals tentacle rake and bite damage.

Spell-Like Abilities: 1/day - call lightning, control weather, control winds, dominate animal, greater magic fang, protection from elements, quench, resist elements. Caster level 9th; save DC 10 + spell level.

Blindsight (Ex): A mooncalf can ascertain its surroundings by non-visual means mostly hearing and scent, but also by noticing vibration and other environmental clues). This ability enables it to discern objects and creatures within 100 feet. The mooncalf usually does not need to make Spot or Listen checks to notice creatures within range of its blindsight.

Keen Senses (Ex): A mooncalf sees four times as well a human in low-light conditions and twice as well in normal light. It also has darkvision (100- foot range).

Mooncalves prefer to fly high above their targets, striking at foes from a distance with their spell-like abilities. In melee, they may grab and crush opponents with their tentacles, or drag foes into their slavering beaks, or command the elements to electrocute an enemy.