It would appear none of this has been updated with anything about archtempered nerg, which is unfortunate because I was hoping for maybe some more advanced insight that might help me not have to use up 3/4 of my item box only to scrape by with 2 faints and 8 minutes left. All the other archtempered elders are legitimately a fraction as difficult, and I can't tell if I'm doing something wrong or he's just that tough, although I guess his mechanics aren't that different from normal/tempered aside from AT taking only maybe 15 secs max to fully regenerate his spikes after they're broken. On top of having probably 3x normal health, more damage than tempered, and becoming and staying enraged from the time you first run into him until the end of the mission. Although seeing as all AT nerg's gear is pretty amazing and you get an ending teaser screen for the expansion after you beat him, I'm thinking maybe he's supposed to be like the last boss of the standard game. I hope so, because lord is he hard. In 270 hours and 125 HRs his mission is the only one I've ever lost by anything except mistakenly killing capture targets.