Updated
gigantes.
Enceladus
Colossal Giant
Hit Dice: 48d8+624 (840 hp)
Initiative: +0
Speed: 40 ft. (8 squares)
Armor Class: 29 (-8 size, +27 natural), touch 2, flat-footed 29
Base Attack/Grapple: +36/+75
Attack: Slam +51 melee (4d6+23) or rock +29 ranged (6d6+23)
Full Attack: 2 slams +51 melee (4d6+23) or rock +29 ranged (6d6+23)
Space/Reach: 30 ft./30 ft.
Special Attacks: Rock throwing
Special Qualities: Low-light vision, resistance to acid 5, rock catching, specialized powers (breath weapon, catch spells, frightful presence, immunity to fire, shockwave)
Saves: Fort +39, Ref +16, Will +16
Abilities: Str 56, Dex 10, Con 36, Int 8, Wis 11, Cha 12
Skills: Intimidate +17, Listen +16, Spot +16
Feats: 16 (9 can be epic)(see below)
Environment: Any
Organization: Solitary
Challenge Rating: 25
Treasure: Standard
Alignment: Chaotic evil
Advancement: —
Level Adjustment: —
His current feats are: Alertness, Awesome Blow, Cleave, Great Cleave, Improved Bull Rush, Improved Critical (slam), Improved Initiative, Improved Overrun, Improved Sunder, Iron Will, Power Attack, Weapon Focus (slam)
Epic Feats: Devastating Critical (slam), Epic Reflexes, Epic Will, Overwhelming Critical (slam), Superior Initiative
To get him closer to his previous Con and hit points, I'd recommend replacing Epic Will and Superior Initiative with Great Constitution (x2). We could also drop Epic Reflexes and replace with Epic Toughness.
Thoughts?