I did lots of CRs from shroom king using sneak / hide as a 56 rogue, in kunark.
Drag corpses to bridge below beetle area, use lower zone out, zone in again, drag corpses up and bag to ZI.
A very small percentage of mobs saw through sneak hide.
http://kyros.info/Rogue/Ragebringer.php
"The undead in the Plane of Hate will see through sneak/hide and normal invis, but other than that, you should be able to reach the book without too much trouble."
Makese sense that sebilis would be pretty safe to navigate, slightly less dangerous then PoH, which was low risk by itself.
Yay solo book fetching!