If you see the 4 center stairs on the map, he's to the west of the far left ones. Find the libray and go to the back and around and down the library stairs.
If you give him, I think 210PP in gold (2100gp) you will get a fire opal.. kinda risky, yes, PKs ya know... But my chanter hjas done it before, just can't remember how much gold you have to give if anyone can put a prioce to this, would be appreciated.
This is the nice fellow you give your lambent stone to, in order to recieve the Darkwood Staff. I just so happened to have a lambent stone laying around and decided to turn it in, sadly like rumored, this staff isn't worth squat and shouldn't be this hard to get. But it's worth about 100-150pp simply because of it's rarity, actual useful value is only 15pp at best. The lambent stone you turn in to get this staff is worth more than the staff itself.