ok, time to start on the individual titans!
Titan, Greater, Atlas
Gargantuan Outsider (Chaotic, Evil, Extraplanar)
Hit Dice: 41d8+697 (881 hp)
Initiative: +5
Speed: 60 ft (10 squares), fly 80 (perfect)
Armor Class: 44 (-4 size, +5 Dex, +33 natural), touch 11, flat-footed 39
Base Attack/Grapple: +41/+68
Attack: Slam +X melee (10d10+X)?
Full Attack: 2 slams +X melee (10d10+X)
Space/Reach: 20 ft/20 ft
Special Attacks: Oversized weapon, spell-like abilities
Special Qualities: Damage reduction 15/epic, darkvision 60 ft, SR 45, unlimited strength
Saves: Fort +43 Ref +31 Will +36
Abilities: Str 48 Dex 20 Con 44 Int 27 Wis 30 Cha 28
Skills: 704
Feats: 7+7?
Environment: Tarterian Depths of Carceri
Organization: Solitary
Challenge Rating: X
Treasure: Double standard
Alignment: Always chaotic evil
Advancement: ---
Level Adjustment: ---
This immense humanoid has an unimaginably massive build, seeming to have muscles where muscles shouldn’t be. His expression seems rather crafty.
Atlas is the embodiment of physical might, and is considered strength personified. Despite his alignment, Atlas can actually be very honorable, and it is well known that if he gives his word on a matter he will keep even if this oath means his death.
Atlas led the Titans in their struggles with the Olympians, and was thus condemned to bear the weight of the earth and sky upon his shoulders forever. Though Atlas is officially a prisoner of Tarterus, part of his punishment involves spending most of his time on the Material Plane.
Atlas is 50 feet tall and weighs X pounds.
COMBAT
Some notes from the original description:
His damage per slam attack was listed as an astounding 10-100 (10d10), far higher than any of his other fellows. How high should we set his baseline damage before adding his strength bonus (and remember, each had varying amounts of damage for their slams).
Speaking of strength, I propose we deal with his might this way. Here is the text: “This strength is drawn from the Prime Material Plane. When the titan is on other planes he only has strength of 25, but when on the Prime Material Plane there is nothing he can't lift, nothing he can't bend, and nothing he can't break!” We’ll say that on the outer planes (or any other than Material) his strength will be at the value we ultimately determine. However, on the Material Plane, his Str score will be effectively infinite for the purpose of lifting, bending, breaking, and any other physical feats. His attack bonus and damage bonus, however, will remain unchanged. Sound fair?
Now, each titan had character levels. Altas was listed as a 19th level fighter and 10th level monk. What class features should we therefore assign him? Since monks are strictly lawful now, I’d be wary about giving him too many monk abilities.