It probably would make the most sense to have each nightmare battle unique to the situation and characters! And there are a couple who are shared by pairs of characters!
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codyfun12329~4Y
Nightmares could also have gimmicks that vary beyond the effective turns the players get. For example, everybody except for the character the arc battle focuses on could be numbed and only able to intervene using their mind, while the star is too freaked out to do anything but use their body.
