Getting this mob to spawn wasn't the issue for us. In 16 hours of real time the past week I have spent farming this camp, he spawned 12 times, dropping the tank shield zero times. Starting to wonder if it's broke.
We've farmed this guy before, probably spawns once every 3 camp clears (all three PHs) or so, never had any problem getting him to spawn.
We've cleared the camps about 20 times now with no spawn. The odds, based on prior spawn rates is about 100 to 1 that he would not spawn. I'm suspecting treachery :). Could just be a server issues, patch goof or rare unlucky odds. Thought it was possible he also spawned someplace else we didn't know about (and was up there and therefore would not spawn a second time). Brought in a tracker. If he's up he's no where close to the usual spawn.
Anyway, something is different. Could be they are pushing the EM15 CotF earring in Neriak, not sure but man we just couldn't get him to spawn. Guess our SK will have to find another shield.