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Clicky - TIPS & TRICKS - ROLEPLAYING GUIDES - UD BEGINNERS GUIDE
It was written some time ago but is a good starting point to learn about the quests and early level maps, and other drow stuff.
Notable Updates:
1) The Basilisks no longer cast Petrification, they just melee. Makes this a good hunting map now as long as your defence is good enough (A step up from the Hulks in the next map, watch for those slime spawns as they can land right on top of you). Also means you don't -need- invisibility for the quests, but advisable until your AC is good enough.
2) The Lore of Ages, Necro / Crypt quest. This has been disabled for months, not sure why and it's a significant quest xp loss. UPDATE: ITS BACK ON!
3) South of Sshamath / Darkwood District - Portals have been added for quick transfer, making the new low level map there easy to reach. The cave (H'lal?) has some chests too for looting, and there is a boat in the Darkwoods for even quicker access.
4) Upperdark - accessible via rat from Undrek Valanar (goto Undrek Naudal), has several new maps from lvl 1 to lvl 18 to run around. It is SHARED SPACE (Ie. You may bump into races that do not like drow, go figure ;P). You can always go off the radar if you prefer. There is a Duergar trader in Naudal to sell loot too.
5) Ruins of Oghren - A higher level map, but no longer accessible from the Mushroom Grove and is part of the Upperdark now, the boat to it is in the Kro's map.
6) Rockrun - Have fun with the Svirf in their new city, just don't get lost (Yes the map is meant to be dark like that, they are a tricky people

7) Undrek Valanar - There are TWO traders in this area now, one may have items you like. Oh and the Fishmonger works there too now, for errr . . fishing (Yes, you can get XP for fishing. Same in the darkwoods).
TIPS
Cross-class that open lock skill. Even just 1 point with enough DEX and maybe an item can open most chests. Its quicker than bashing for most and can mean 4 to 5 hundred xp every reset if on a loot run (average 15-20xp per chest, maybe more).
Do not sell gems to regular traders, sell them to the specialist

Do not be afraid to exchange tells with someone, especially if you are uncertain about something. Though some PC's you meet maybe edgy or harsh, the players behind them are usually not.
The UD is HARSH however, expect it, savour it. For those times you really just want it easy then create a surface PC and it will be easier, also more open RP around campfires, DM events. Its just how it is, doesn't mean you cannot do both though and log in with which ever PC suits your mood.
BigJ