Location: Lorien, the mirror of Galadriel
Quest: Find Galadriel, have a group of legends ready at the mirror. Ask Galadriel mirror, when she finally asks you to follow you need to follow.
After you follow and some talk you arrive in the Witch King zone. This zone is a parallel world, you start without equipment, and you don't loose exp when you 'die' here. At the starting point of this zone some equipment is on the ground, so distribute it among your group members.
The zone itself is mudlled in same way village near Ingrove which can be burned (via “burn village” command), here the fire is initiated automatically and cannot be stopped. Eventually whole place will burn as fire spreads, so you only have limited time to defeat the Witch King. Sleeping in any room periodically causes a pop (with random delay and possibly repetitive) of an aggressive mobile and puts you to magic sleep, so you can't wake unless attacked. After you attack Witch King, resting also causes pop of aggressive mobiles.
There are many identical patrols and one medium smob on the way to final smob. Kill them all, loot some eq from them, and some scrolls from a chest.
The final smob is the Witch King, who is basically a summoning version of an ebon wraith. Best strategy is to blind him and eliminate all the enemies he summons. Once he stops summoning, just get him to low wounded to win.
Reward: Experience for the dead mobs, (even if you fail to kill the Witch King)
Everyone in group gets one of:
elven longbow (faster/lighter version of embellished with bit less damage)
golden belt (+1 db, +2 moveregen)
Some box (advance growth on shrubs)
finely woven hood (+3 db)
finely woven cloak (+6 db +5 moveregen)
mallorn brooch (useless)
Group needed: This quest is only given to groups of legends. Group size which can finish it easily: 2 50+ clerics and 2-3 50+ warriors. Maximum size of group seems to be 7 and it is good idea to bring in as much as possible (more ppl ⇒ more reward items). Actual requirements might depend on group size though. At least if you enter with 7, you must defeat the Witch King. Else you end up with mallorn brooch which is guaranteed as minimum reward.