When I did that 2nd boss at 63, I basically flipped the lever, killed the first two groups normally (not hard). Saved EM+CL for the 3rd group, had to toss one heal in there. For 4th group, I basically went LB, CL, shock, heal, heal, CL, shock, heal, heal, clean up the leftovers. WIth fire nova totems sprinkled in there. Remember to keep water shield up as soon as the last one dies in each group. Then just drop stoneclaw totems to aggro the boss and run to the other side of the room. Redeploy wrath totems and nuke it down.
