No need I'll take a Thayan Law books and Arcana to help her two knowledge skills. 500gp. Her brother likely would want books of his own. Its not like Thayan Law is complex Red Wizards tend to win in legal matters unless stupid, or to cheap to pay a fee for a legal evaluation and research of their case and the other party does. When its non-Red Wizards to others it gets more complicated. Non-Thayans barring a diplomatic protection lose every time to any citizen of Thay without a major fee to the court under the law of the Tharch triple the normal one. Even then the non-Thayan still may lose.
But she worships Kossuth so she has to give pain to Red Wizards to from time to time, to test them or show even the mighty is not above the law. Within reason. Like family.
Actually, reading over the rules a little more closely, I realized that I screwed up. ^^; Paying 500 gp merely gets you the space to store two lots of books and somewhere to look through them comfortably for research purposes. Presumably, you'd already get at least storage space for free in the house provided by the GM, so you wouldn't pay that. Each lot of books costs 1,000 gp for a circumstance bonus to a single skill, though, which is still cheaper than the 5,000 you were planning to spend.
And if giving other people pain is what you want to do, you should totally worship Loviatar instead.
She's Lawful Evil, you could easily still keep your alignment and everything.
this is going to take longer than I'd like due to family and life.
Ah, that's too bad to hear. I was going to suggest that your Illithid and Re Z L's Thrallherd could totally run some sort of secret cult together. You're both psions, after all.