Vasuthant, Horrific (CR 17)

Huge Undead
Alignment: Always chaotic evil
Initiative: +10 (+6 Dex, +4 Improved Initiative); Senses: blindsight, darkvision 60 ft., Spot +29, and listen +29
Languages: No language

AC: 24 (-2 size, +6 Dex, +10 natural), touch 14, flat-footed 16
Hit Dice: 25d12+150 (312 hp); DR: 15/magic
Fort +8, Ref +14, Will +17
Speed: Fly 30 ft. (perfect)
Space: 15 ft./15 ft.
Base Attack +12; Grapple +35
Attack: Slam +21 melee
Full Attack: 2 slams +21 melee and up to 4 enervating crushes
Damage: Slam 2d8+11/19-20, enervating crush 4d6+11 plus 1d8 Str
Special Attacks/Actions: Enervating crush, improved grab, reality distortion, spell-like abilities
Abilities: Str 32, Dex 23, Con -, Int 10, Wis 16, Cha 23
Special Qualities: +2 turn resistance, alter past, immunity to acid and cold, immunity to light, resistance to fire 25 and electricity 25, trap light, undead traits, unholy toughness
Feats: Alertness; Awesome Blow; Flyby Attack; Improved Bull Rush; Improved Critical (slam); Improved Grapple; Improved Initiative; Improved Overrun; Improved Sunder; Power Attack
Skills: Concentration +28, Hide +22*, Move Silently +28, Spot +29, and listen +29
Advancement: 26-34 HD (Huge); 35-48 HD (Gargantuan)
Climate/Terrain: Any
Organization: Solitary
Treasure: None

Source: Monster Manual III

A horrific vasuthant has grown massive and terrifying after centuries of absorbing life energy. Horrific vasuthants have more potent reality distortion powers than ordinary vasuthants, in addition to spell-like abilities.

A Huge horrific vasuthant is 15 feet in diameter. As it advances in Hit Dice and becomes larger, its diameter increases to 20 feet at Gargantuan size and 30 feet at Colossal size. Horrific vasuthants are weightless and know no languages.