Thank you both, and may the Gods be ever in your favor! ;)
I will indeed be starting my search at Lexicanum, and it goes without saying that I'll need every core rulebook and Chaos codex, as well as Eldar codexes as they relate to the birth of the Prince of Pleasure and Pain. Also, yes, my studies will bridge the dimensions to include tomes from WFB. Not sure if I care about Age of Sigmar, though. . . .