Metafeats... What are you planning on using them for? Ftr2/Monk2 for 4 bonus feats? Lol.
I'm thinking Impatient Learner, which lets you replace a Feat in order to meet the requirements of any other Feat, and Epic Spellcasting.
I found the PRC I was thinking of and the character will focus on corruption. Tricking people to do evil deeds to outright forcing them too in an attempt to make people fall from grace. Build wise this is taking the form of an StP Erudite 6 /
Insidious Corrupter 10 / We'llneverseeit 4. It's not a full caster since IC is a 5/10 PrC, but the chances of us seeing lv7 is pretty slim anyway, and in that 1,001 chance I'd have the StP pool to draw utility from for out-of-combat solutions anyway. Feat wise, not 100% on, Vile Spell will be used for persuading demons/devils, and that is help me or permanently lose your vital essence until you beg God to forgive you (well, get someone to bless the area with consecrate then heal you with positive energy, sounds pretty out of bounds in hell). I strongly suspect Metapower(linked power[bestow power]) is probably out through, maybe Skill Focus(ecdysiast)?
Needs OKs on; Psionic adaptation of Insidious Corrupter & Vile Spell, maybe overlooking Insidious Corrupter's Racial Requirement (drow-only), would honestly would prefer Cha based manifesting over Int for the synergy of Skills & IC's mental claws. *assuming* your fine with Cha based, what about
Lesser Unseeli Fey as well?