Climbing city gates is the prerequisite of tree surfing which is very useful in the Brimloch Roon area, where the sequence of two quests is wrong.
The primary source of knowledge on tree surfing is
Xignal's site. Click on "cool activities and strange places". I wanted to make an exact link for you, but I was unable to access the site at the time. It should still be working, though.
Also Sazerac has made an excellent post on
Page two of the best tips page about how to complete the "seed from the living tree" quest. It also details the matter.
[ 06-07-2004, 08:56 PM: Message edited by: bsftcs ]