Dracolich, Ancient Blue* (CR 23)

Gargantuan Undead
Alignment: Lawful evil
Initiative: +0; Senses: blindsense 60 ft., darkvision 120 ft., keen senses, low-light vision, Spot +41, and listen +41

AC: 40 (-4 size, +34 natural), touch 8, flat-footed 42
Hit Dice: 33d12 (214 hp); DR: 15/magic and 5/bludgeoning
Fort +18, Ref +18, Will +23
Speed: 40 ft., burrow 20 ft., fly 200 ft. (clumsy)
Space: 20 ft./15 ft.
Base Attack +33; Grapple +57
Attack: Bite +41 melee
Full Attack: Bite +41 melee and 2 claws +36 melee and 2 wings +36 melee and tail slap +36 melee
Damage: Bite 4d6+12), claws 2d8+6, wings 2d6+6, tail slap 2d8+18
Special Attacks/Actions: Breath weapon, control undead, create/destroy water, crush, frightful presence, paralyzing gaze, paralyzing touch, rend, snatch, spell-like abilities, spells, tail sweep
Abilities: Str 35, Dex 10, Con -, Int 20, Wis 21, Cha 22
Special Qualities: immunity to cold, electricity, magic sleep effects, polymorph, and paralysis, invulnerability, SR 30, undead traits
Feats: Blind-fight; Combat Expertise; Extend Spell; Flyby Attack; Hover; Improved Maneuverability; Large and in Charge; Power Attack; Recover Breath; Rend; Shape Breath; Snatch
Skills: Bluff +42, Concentration +27, Diplomacy +46, Disguise +6 (+8 acting), Gather Information +8, Hide +19, Intimidate +44, Knowledge (arcana) +24, Knowledge (geography) +15, Knowledge (history) +15, Knowledge (local) +15, Knowledge (nature) +15, Knowledge (religion) +15, Search +41, Sense Motive +41, Spellcraft +43, Spot +41, Survival +5 (+7 above ground natural environments, avoiding getting lost, following tracks), and listen +41
Advancement: 34-35 HD (Gargantuan)
Climate/Terrain: Temperate deserts
Organization: Solitary
Treasure: Triple standard

Source: Draconomicon

This diabolical creature has turned an ancient tomb complex into its lair. Once a place of respect for the dead, the area has become a charnel house.

This is a sample creature derived from a Template.