I thought it was in LM but no luck, Not in Magic nor Monsters of Faerun either. I don't have Heroes of HorrorHmm. I remember seeing and using the feat, but I don't recall where I saw it. I'd recommend LM, Heroes of Horror, and Magic of Faerun as my first guesses though, looking at my bookshelf.
I have suggested the system change, but the DM wants to run a high-level (13 start) set in Forgotten Realms, he wants to stick with 3.5.In Pathfinder, undead get +Cha to HP by default. No need for feats.
I did not mean to hijack the thread.Oh. As Gorbacz Said.
I assumed when you were talkign about 3.5 feats you were going slightly off topic into a tangent about a 3.5 game.
I am preparing a 9th level cleric lich of Mystra, human LG. (13th level after adjustment from lich.) Originally from Netheril, with lots of craft feats plus Leadership and the one I can't find. I plan on playing it as an undead, clerical version of Elminster. She would be higher level if so many magical items floating around the Anauroch desert and surrounding regions.