Can confirm he pops in the first hall after the circle room at zi with the zek statue. Took about 12 hours to get him to show up. Dropped earring. Good luck with this camp, it's boring and long.
Found him wandering the central corridor right after the first circle room. He wandered the ramp, pausing at each end. Easiest way to fight him is to IVU then charge into the ramp when he's not within shared-aggro range with other mobs. There are no other wanderers down this part of the central corridor.
Jagged Frosteel Lance (No Trade, Magic, Lore, 2H Pierce, WAR PAL RNG SHD BER, Freezing Strike III, 49 Dam, 32 Delay, Bonus 51, AC 15, 16 to Stats except WIS/INT, 8 FIre, 20 Dis, 30 Cold, 10 Magic, 20 poison and 345 to Mana, HP and End. Weighs 5.9 and required L73 and Recommend 75.
Mark of Rallos Zek (No Trade Quest item, says all classes and lists most races)
A Large Softly Glowing Powersource (No Trade Quest Item)