(PRESTIGE CLASS)
Arcane Tricksters combine their knowledge of spells with a taste for intrigue, larceny or just plain mischief. They are among the most adaptable of adventurers. Arcane Tricksters tend to use a seat of the pants approach to adventuring, loading up on spells that improve their stealth and mobility.

Hit Dice: d4.
Proficiencies: Arcane Tricksters gain no weapon, armor or shield proficiencies.
Skill Points: 4 + Int Modifier.
Primary Saving throw(s): reflex, will.
Base Attack Bonus: +1/2 levels.

Alignment: Non Lawful
Skills: Lore 4 ranks, Disable Trap 7, Pick Lock 7.
Sneak Attack: 2d6
Spells: Must be able to cast at least 3rd level Arcane spells.
Special: a book of Arcane Trickster is required to unlock the class.

Level
1: Ranged Legerdemain - Trap & Pick Lock at 30' range, once per day.
2: Sneak Attack 1d6.
3: Impromptu Sneak Attack - Arcane Trickster causes a sneak attack on target, can be used once per day.
4: Sneak Attack 2d6.
5: Ranged Legerdemain - Improves to two uses a day.
6: Sneak Attack 3d6.
7: Impromptu Sneak Attack - Improves to two uses a day.
8: Sneak Attack 4d6.
9: Ranged Legerdemain - Three uses a day.
10: Sneak Attack 5d6.

Upon gaining a level in Arcane Trickster, the character gains new spells per day as if he had also gained a level in his highest caster class (bard, sorcerer, or wizard). He does not learn any new spells through his abilities. He does not, however, gain any other benefit a character of that class would have gained (e.g., improved familiar, bonus feats)

Combining choice elements of the epic rogue and epic wizard, the epic arcane trickster is a force to be reckoned with, unless you're looking forward to having your vault looted.

Hit Die: d4
Skill Points at Each Additional Level: 4 + Int modifier

Spells: The epic arcane tricksters caster level increases by one per level gained above 10th. The epic arcane tricksters number of spells per day increases until his caster level reaches 20th.
Sneak Attack: The epic arcane trickster's sneak attack damage increases by +1d6 every 2 levels above 10th.
Impromptu Sneak Attack: The arcane trickster may use this ability one additional time per day for every four levels above 7th.
Ranged Legerdemain: The arcane trickster may use this ability one additional time per day for every four levels above 9th.
Bonus Feats: The epic arcane trickster gains a bonus feat (selected from the list of epic arcane trickster feats) every 4 levels after 10th.

Epic Arcane Trickster Bonus Feat List: Automatic Silent Spell, Automatic Still Spell, Blinding Speed, Epic Skill Focus, Improved Combat Casting, Improved Sneak Attack, Lingering Damage, Self-Concealment, Sneak Attack of Opportunity.