They simply do not exist. Sure you could say I have somehow missed this mob in the last 50 BoPS I have done. Even though I have scoured every inch of the place. Every other mob in the place respawns (except bosses), yet the Endless Zealot never respawns - nor does this mob even show up initially. Am I missing something? Can anyone shed some light on where this mythical mob can be found. I have contacted Trion - to report a bug... who knows maybe they arent there and no one has bothered to tell trion. But, on their reply communication I was told I was requesting confidential information and that they could not help me.. lol.
Oh, and the reason I need them is for the battle of port scion achievement to kill one of each of the endless mobs - got them all except the endless zealot.

Also, of course I have searched the web - returns useless info. one site even put little dots where these spawn... no they weren't there either.