Its the same on heroic, with second envoy, 26m power.... I have beat firelord, but i am one of those 1-3 ppl on the server but the second envoy only gives ironheart sword/staff plans, LVL 60 items but he is kinda hard, the fact that my bloodstorm with 166 dodge cant dodge him is kinda funny..

After this Firelord boss, the bosses return to about 1.5m power.. keep trying though, one of the rewards could be a leader card