Slug: To find Xen Xheng (or any other person), cast "Locate Person" (Mind spell) at the highest level. It will tell you who's living, who's dead (remember the NPC's kill each other, too!) and where the living ones are. Only one bug I've noticed: it will still tell you that Yamo is in Ukpyr, even after he's dead. It only gives general locations, like "Old Cemetery", "Funhouse", "Giantlands", "Tramontane", so you'll need to head there fairly quickly when you get the "summons." I've also found that after a while, the NPC's will hunt you down!
Faerie Rod and Diamond Eyes tend to be in the Gorrors chests, although I've found them in chests in the Hall of the Past. They're pretty much random, so reload if you don't like what you get.
The City of Sky weapons are:
1: the Mercurian Light Sword (great melee weapon)
2: the Mercurian Light Shield (gives 90% resistance to magical effects)
3: the Frontiersman Phaser Pistols (fires Light bullets which do mega damage, need powerpacks to charge)
4: the Cobaltine Power Glove (same as Vi Domina has; does pretty much the same as the Phaser Pistols).
HINT! IF you completed Wiz 6: Bane of the Cosmic Forge AND leagued with the Bane King and Rebecca rather than fighting them (i.e., you dropped the Queen's silver cross before meeting with them), Rebecca will give your characters a Diamond Ring. This can be used on one of the other doors in the Hall of Preservation (someone likes New Orleans Jazz at Sir-Tech

) and you can get 2 items instead of 1. (Light key on one, diamond ring on the other).
Good hints, Knarfling. I, like Scronan, never fought T'Shober, and preferred to do the Hall of the Past thing. However, one game in which I leagued with the T'Rangs, I fought the Umpani over and over and over in the Umpani Headquarters. My characters shot up to level 50, and I hadn't even gotten to the Dane tower yet!
The items square thing, however, I never had a problem with. Before meeting with Bleinmeis, who steals items from you (including needed quest items!), I always dropped everything I had that wasn't equipped in the square right before meeting with him. When I went back, everything was there, although it took a lot of sorting out! Quite often, I had about 30-45 items dropped there. Maybe yours was a fluke...? Or maybe mine was. I rarely dropped anything, except for that one instance.
The other thing is: if you've got a cursed item equipped that another class can't wear, it generally will not let you change to that class until you've uncursed the item and unequipped it. I can only assume that the "Gown of Divinemail" can be worn by monks as well. (It may be like the Dragon Armor in WW that can be worn by all classes).
I assume everyone has read the thread about charging the Thermal Pineapple to be able to use it in battle? It casts a 6th level Nuclear Blast spell and can pretty much take out almost any group of monsters, or at least do some major damage to heavy-duty ones that aren't fire-resistant. Keep it charged up with the "Recharge" spell.
-Sazerac