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[AridElf]

This, it clearly shows the progress before you click join, if you joining end sessions, that is solely the persons fault for not reading the progress sheet before going in, it can easily be controlled.

Thing is, when the final boss is defeated there is NO need for reinforcements so it really makes no sense in the first place. At the very least it should change the 'progress sheet' to 4/4 or whatever the number of steps there are for each instance, that way there is no confusion at all.