Talk:The Labyrinth of Infinite Dimensions/@comment-67.233.163.219-20131003033131/@comment-1321146-20131003183347

No outright penalty, except you miss out on 10% or 15% bonus progress.

As for help from allies - you either kills the boss yourself with one hit of 30% ATK Power, or your friends do. In the latter case, you didn't do anything, so you probably wouldn't get any bonus progress for it either. - And then you may as well just have run away.