My experience strongly suggests it doesn't matter which river or water square one the wilderness map you search. In my most recent two games I created the staircase next to the Tomb of the High Kings entrance. 93.132.27.7 01:57, 1 September 2009 (UTC) (Silfir being lazy)
That is also my understanding. It can be created anywhere in the wilderness. Ascyron 09:14, 1 September 2009 (UTC)
TrueSoirana 12:18, 1 September 2009 (UTC)
For the purposes of this wiki, what constitutes a "small" alignment boost? I went from N+ to LN at level 26, skipping NL entirely and falling from championship, one time for completing the quest. Sorear 10:04, September 14, 2009 (UTC)
Remind me sometime to test what the exact gain is, but I would say that doesn't constitute a small boost. Ascyron 10:39, September 14, 2009 (UTC)
I don't remember the exact values, but my memory is that NL is only around 100-200 stones wide, so even a relatively "small" boost could easily push you from N+ to LN. If someone was willing to put in the effort, it might be worthwhile to replace all of the rather vague "small boost" talk with some detailed testing from scrolls of balance... JellySlayer 14:45, September 14, 2009 (UTC)
Searching(finding) for the underwater stair case seems to be impossible with a source of leviatation on.