I'm sure you guys are brewing up something over there but I had an idea....
My thought would be a unique and teamwork based map so here goes
Imagine there are 3 phases to this portal. First phase spawns several different mob types and the first 2 bosses from Elder Woods all at the same time. Bosses and mobs have the same abilities in this map so dispatching them quickly would be a must. Warriors would taunt and take care of the mobs to help prevent poisoning to spread to the high dps members of the party. Mages and rogues would then deal with the bosses. Phase 2 would be the same thing just with the last 2 bosses of Elder Woods. Phase 3 could then be Elite Hedo. Possibly with more mobs spawing in.
Any critiquing or expansion on this is highly welcomed ,)