Warning - this mob killed me on the zone-in from Corathus Creep. He backstabs, sees thru invisibility, does not summon.
I watched the area afterward for a while after I recovered my corpse - he seems to be the only one that patrols around on the "fungus bridge" that's just to the left of the zoneline coming from CC. Conned scowling and red to an invised 51st level gnome wizard of Solusek Ro.
So if you're zoning in from corathus, be careful - the path to the left on the bridge is where he patrols. I also didn't see him coming before the attack, but heard his footsteps. Do mobs sneak? This was my first time down here, to get some spells from Brother Hidden Path. (and yes I did finally get the spells, yay me, by circling around to the right, over the "town" and running across the lake with O'keils Levity on)
Good luck down here - looks like an awesome zone!