It could be cool of they made some sort of instance where 2 groups are competing with each other, taking down bosses, and ending up in the same room, where they have to battle the boss AND each other.
The concept would be that a group signs up for the instance (standard 5 man group) like you do with BG's. Then once 2 groups are ready both groups start at the same time.
You then have to beat 2-3 bosses, loot etc. as any normal instance, but the final boss is a fight between the groups, and the boss...or if one of the groups are really slow, just one group, the winner naturally gets to loot him. It is up to each team to figure our whether they should aim for getting to the final boss fast, thereby hoping to avoid fighting the other team by killing/looting boss before they arrive, or if they should fully heal and buff to prepare for possible pvp and boss fight. hoping to catch the other team on their knees.
这样设定一个副本应该会很酷：两组人在副本进行推boss比赛，在最后boss那里碰面，然后与boss以及竞争对手一起作战（大乱斗 =。= 杀掉对手同时杀掉boss）。
两支队伍像排战场那样进入副本（5人副本），同时准备好后游戏开始。需要像普通副本一样击败2-3boss，当然还要分配物品。最后的boss则是两组队伍和boss之间的乱斗，或者，如果对手太慢的话就是一个队伍独享了，最后的胜利者获得boss的掉落。所以就要考虑是尽快的达到boss处并且在对手到达之前杀掉boss还是加满buff等着和对手以及boss决战。
This would indeed be the largest challenge seen from the developers perspective, but I am sure it would be possible to think of some creative way of balancing such an encounter.
那就是一个非常大的挑战，但是我确信我们会找到相关平衡的方法。
