I attempted to solo this wurm. Not a good idea
Found that if you run out of most of the mobs aggro range in Kunark, your pet can die and you wont have the mob running after you immediately. You have time to summon and buff another pet before you get back into its aggro range. This helps with the occasional ***** up that happens with chaincasting pets.
This wasnt the case with nez, it summoned me when i was way out of its aggro range. I gated out to the zone line. Then it was still able to summon me, ALL the way across the zone. Luckily on the second gate to the zone line, i was able to run and zone out.