Few can match the guile and craftiness of arcane tricksters. These prodigious thieves blend the subtlest aspects of the arcane with the natural cunning of the bandit and the scoundrel, using spells to enhance their natural thieving abilities. Arcane tricksters can pick locks, disarm traps, and lift purses from a safe distance using their magical legerdemain, and as often as not seek humiliation as a goal to triumph over their foes than more violent solutions.
The path to becoming an arcane trickster is a natural progression for rogues who have supplemented their talents for theft with the study of the arcane. Multiclass rogue/sorcerers and rogue/bards are the most common arcane tricksters, although other combinations are possible. Arcane tricksters are most often found in large, cosmopolitan cities where their talents for magical larceny can be most effectively put to use, prowling the streets and stealing from the unwary.
Role: With their mastery of magic, arcane tricksters can make for even more subtle or confounding opponents than standard rogues. Ranged legerdemain enhances their skill as thieves, and their ability to make sneak attacks without flanking or as part of a spell can make arcane tricksters formidable damage-dealers.
Alignment: All arcane tricksters have a penchant for mischief and thievery, and are therefore never lawful. Although they sometimes acquire their magical abilities through the studious path of wizardry, their magical aptitude more often stems from a sorcerous bloodline. As such, many arcane tricksters are of a chaotic alignment.
Hit Die: d6.
To qualify to become an arcane trickster, a character must fulfill all of the following criteria.
Alignment: Any nonlawful.
Spells: Ability to cast mage hand and at least one arcane spell of 2nd level or higher.
Special: Sneak attack +2d6.
The arcane trickster's class skills (and the key ability for each skill) are Acrobatics (Dex), Appraise (Int), Bluff (Cha), Climb (Str), Diplomacy (Cha), Disable Device (Int), Disguise (Cha), Escape Artist (Dex), Knowledge (Int), Perception (Wis), Sense Motive (Wis), Sleight of Hand (Dex), Spellcraft (Int), Stealth (Dex), and Swim (Str). (all skills taken individually)
Skill Ranks at Each Level: 4 + Int modifier.
All of the following are class features of the arcane trickster prestige class.
Weapon and Armor Proficiency: Arcane tricksters gain no proficiency with any weapon or armor.
When a new arcane trickster level is gained, the character gains new spells per day as if she had also gained a level in a spellcasting class she belonged to before adding the prestige class. She does not, however, gain other benefits a character of that class would have gained, except for additional spells per day, spells known (if she is a spontaneous spellcaster), and an increased effective level of spellcasting. If a character had more than one spellcasting class before becoming an arcane trickster, she must decide to which class she adds the new level for purposes of determining spells per day.
An arcane trickster can use Disable Device and Sleight of Hand at a range of 30 feet. Working at a distance increases the normal skill check DC by 5, and an arcane trickster cannot take 10 on this check. Any object to be manipulated must weigh 5 pounds or less. She can only use this ability if she has at least 1 rank in the skill being used.
This is exactly like the rogue ability of the same name. The extra damage dealt increases by +1d6 every other level (2nd, 4th, 6th, 8th, and 10th). If an arcane trickster gets a sneak attack bonus from another source, the bonuses on damage stack.
Beginning at 3rd level, once per day an arcane trickster can declare one melee or ranged attack she makes to be a sneak attack (the target can be no more than 30 feet distant if the impromptu sneak attack is a ranged attack). The target of an impromptu sneak attack loses any Dexterity bonus to AC, but only against that attack. The power can be used against any target, but creatures that are not subject to critical hits take no extra damage (though they still lose any Dexterity bonus to AC against the attack).
At 7th level, an arcane trickster can use this ability twice per day.
Starting at 5th level, an arcane trickster can cast her spells without their somatic or verbal components, as if using the Still Spell and Silent Spell feats. Spells cast using this ability do not increase in spell level or casting time. She can use this ability 3 times per day at 5th level and one additional time per every two levels thereafter, to a maximum of 5 times per day at 9th level. The arcane trickster decides to use this ability at the time of casting.
At 9th level, an arcane trickster can become invisible, as if under the effects of greater invisibility, as a free action. She can remain invisible for a number of rounds per day equal to her arcane trickster level. Her caster level for this effect is equal to her caster level. These rounds need not be consecutive.
At 10th level, an arcane trickster can add her sneak attack damage to any spell that deals damage, if the targets are flat-footed. This additional damage only applies to spells that deal hit point damage, and the additional damage is of the same type as the spell. If the spell allows a saving throw to negate or halve the damage, it also negates or halves the sneak attack damage.