I found an even EASIER way to do this IF you know the WoJ is up--use a ranger. All you need is levitate and invis.
FIRST, levetate (or air-elemental) and invis. yourself.
NEXT, get up to the invisible walkway however you like. (I used the postings below--VERY helpful--especially the one about the phatom wall to walk through).
NEXT, once at the top of the invisible walkway, looking up, run toward the first reaver's house (BIG house on far west edge of zone). Land on the very top--the part with the pointed peak roof.
NEXT, stand on the peak and look up...there's the Wraith of Jaxion. :-) Charm him. He will fall and climb up to you in about 10-20 seconds. Do the turn in and gate out.
Minimal casting, minimal danger, no fighting. Plus, it leaves the Wraith alive for the next chanter to come along...