Orvunk

Here's a fun little critter if anyone has a campaign going in the Abyss.
Orvunk The Bound: Guardian of Overlook
Orvunk is a Fiendish Great Wyrm who was bound to Overlook eons ago, long before the Queen of Demons was overthrown. He is a bitter, angry creature who is bound under an ancient geas to guard the device controlling the Wells. Unless one can defeat him, give the proper passcode, or somehow convince him to aid one (Diplomacy DC: 45, may be lowered with proper arguments or tribute; Bluff DC: 55, may be lowered with tribute). Orvunk loves Chaos and hates the demons that have bound him. While he loves treasure as much as any other dragon it takes something truly special to tempt him. Because of the tens of thousands of years he has been bound within the keep Orvunk's wings have atrophied to uselessness, they are tattered and shrunken remnants of their former glory.
Orvunk the Bound: Colossal+ Fiendish Red Dragon (Chaotic, Evil, Extraplanar, Fire)
Hit Dice: 70d12+4,900 (5,740)
Str: 70, Dex: 20, Con: 70, Int: 66, Wis: 62, Cha:62
Initiative: +9
Reach: 20ft
Armor Class: 57 (-8 Size, +5 Dex, +50 Natural), Touch 2, flat-footed 52
Base Attack/Grapple: +40/+73
Attack: Bite +70 (8d8+17)
Full Attack: Bite +70 (8d8+17), 2 Claws +65 (4d8+17), 2 Wings +65 (4d6+17), Tail Slap +65 (8d8+17)
Reach: 5ft/5ft
Special Attacks: Breath Weapon (Cone of Fire 80ft), Spell-like abilities, Crush, Smite Good, Snatch, Spells
Special Qualities: Darkvision 60 ft, DR 50/Good +10, Frightful Presence, Immunity to Fire, Cold Resistance 20, SR 70
Saves: Fort +39, Ref +20, Wis +27
Spell-like Abilities: At Will suggestion, discern location; 3/day find the path Spells: As 35 level sorcerer
Skills: Appraise +73, Bluff +65, Climb +60, Craft +62, Diplomacy +72, Intimidate +75, Knowledge (Wells of darkness) +73, Listen +67, Search +60, Sense Motive +70, Spot +68, Use Magic Device +59
Feats: Awesome Blow, Cleave, Great Cleave, Improved Bull Rush, Improved Initiative, Iron will, Lightning Reflexes, Power Attack, Snatch, Dark Speech (Vile), Chaotic Spell Recall (AH), Heart of the Nabassu (AH), Keeper of Forbidden Lore (AH), Precognitive Visions (AH), Primordial Scion (AH), Improved Spell Capacity, Empower Spell-like ability 1/day, Maximize Spell-like ability 1/day, Ignore Material Components, Immortal, Epic Spell Penetration, Epic Spell Casting
Epic Spells: Create Living Vault, Dreamscape, Epic Counterspell, Epic Spell Reflection, Greater Ruin, Hellball, Momento Mori, Nailed to the Sky, Ruin, Safe Time, Soul Dominion, Spell Worm, Vengeful Gaze of God,
Environment: Wells of Darkness
Organization: Solitary
CR: 40+