Spawns at roughly 2355, 240, 290; location for "poshadow.txt" map file (note for all known Plane of Shadow named map points, see this quest entry):
This named is permarooted. "Repel" (with knockback) is cast on a random target every 20 seconds.
Zel Kaxri is also a part of the group mission "Breaking the Seal" (see this quest entry for details).