Iksar in Neriak...
Never done it mind you, but here is what you might get you going...
Guards (inner outer NOT indigos)
As Iksar you need to invis yourself into Neriak 3rd gate. There is a NPC there you give red wine to, in the Library. It might be tricky if you are KoS and cannot sneak. There are ways around this:
1. Get a Dark Elf Illusion Potion
2. Get an enchanter to charm him
3. Start a turn-in, and have someone invis you or hide, then complete turn-in.
Once you are dubious or above keep giving him red wine. He is on Dark Bargainers faction, and will be ally to you before long. You need to keep giving him wine until the guards dont attack you. Tricky to check, yes.
Clerics
Not sure but you might be able to use DE potion. Get a note from the DE cleric in East Freeport Tunnels to take to Neriak Cleric Guild. Do this a few times you should get non KoS to the Clerics.
Shadowknights/Necros
Kill Arcane Casters in Nektulos. This will take a while since there are only 8 or 9 of them.
Int Casters
Not really needed unless you go to their guild. I would have to look this one up.
Indigo Brotherhood (Warriors)
Kill light elves, but this would ruin elf factions.
Edited, Thu Jan 12 15:45:25 2006 by Dothammer