Impromptu Sneak Attack (Ex)
Prerequisites: Advanced Talents class feature, able to cast arcane or divine spells.
Benefit: Once per day, a rogue with this talent can declare one melee or ranged attack she makes to be a sneak attack, with the normal range restrictions on ranged sneak attacks. 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 not subject to critical hits take no extra damage. A rogue can pick this talent more than once, and each time he can use this ability an additional time per day.