Awesome!
I'll give coding it a go then and see what I can come up with.
Here's my very first thoughts on it:
It seemed like the very core basics I won't have problems with because I can review examples of other classes for entry requirements, feats gained as each level, and basic progression.
I'll take a look at other favored-enemy-providing classes to see how they handle that aspect, noting that this class doesn't get *more* favored enemies, only improves the one selected upon entry. I'm not certain about the 'psionic' portion of the favored enemy yet.
Enemy Sense seems like a player-selectable radius search for creatures of the favored type, so not too hard, once Favored Enemy is figured out.
For Brain Nausea, are there any creatures that actually try to eat brains in NWN? I don't recall even Illithids trying that in NWN, but its been a while since I encountered them in play.
Cerebral Blind seems like classic non-detention, but I'm not certain what other effects can be used to detect at a distance in NWN, nor if it’s possible to shield against. If there's any examples of this in effect already or spells/abilities it would intersect with, I'd appreciate any pointers to those so I could look them over.
Breach Power Resistance looks like and OnHit type effect, and there are spells that exist that lower SR for a time, so I can look into how those work.
Cerebral Immunity looks like permanent Mind Blank.
Blast Feedback would probably be the tougher one in that it might have to touch other scripts to check their targeting. But it specifies Mind Blast, so maybe only a couple of scripts will be affected.