Cool Under Fire (General)
You maintain your poise under the most adverse circumstances, due to your endless reserves of self-control and utter confidence.
Prerequisites: Level 6th+, Cha 13+.
Benefit: Select a number of skills equal to your Charisma modifier. When making a skill check with one of these skills, you may Take 10 even if stress and distractions would normally prevent you from doing so.
Special: Characters may take this feat multiple times, selecting additional skills for it to apply to each time.
Kelleris said:Hm, that's surprising. :\ Most skill-type rogues tend to be at least mildly dashing. Do you actually want the skill mastery-like ability, or do you just want to get into the PrC. I'm perfectly fine with waiving that requirement.
And, in any case, the skill mastery ability doesn't really have anything to do with your skills either; it doesn't grant any kind of bonus. What it represents is the surety and confidence necessary to do something exactly how you were trained to do it in adverse conditions.
Failing that, I think the Int-based one would be okay.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.