how do i find sudannellser(?) after irenicus has hidden it?

Ahem, AD SPOILER YOU IDIOT!
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But to answer your question, you most retrieve the Rhyn latorn from Bodhi.

[This message has been edited by Dreamer128 (edited 10-27-2001).]

explain further

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Go to the area where you fought the vampires before. Kill everyone again, use holy water on the pool where the mace is hidden go to the lower floor, kill everyone again, use water again, then kill Bohdi. The lantern is down there somewhere, cant remember where off the top of my head.

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where i killed them before? The graveyard crypt?

yes,
But you should first obtain this quest from the elven fieldcommander ...
You should meet him after you exit the underdark

I've done that so now i go to the crypt and put holy water in the blood puddle.
What about enlisting help, ive heard about that somewhere