Did Einherjar tonight and won. Went in with 2 full alliances divided up into 5 DD groups and 1 BLM group. DD groups were set up with 1 tank, 3 DD, 2 healer/support mages. Had several brds interspersed for sleep.
Each DD group fought its own mob with BLM pty nuking where needed. We had 2 separate sets of mobs, 10-15 Bats, and 10-15 hounds. Mega was a Wivre. The random mob popped (was a bird) and was killed, but didn't notice any difference. Had 3-4 minutes left when Mega died. Unfortunately no good drops, but did get key item and 500 ichor.
This was a blast, and can't wait to do it again.