Vexed
First Post
I would give them amnesia or mpd(multiple personality disorder); the artifact turned them all into one body. (I had my party once have to save and deliver a character with mpd in a game once, it was different...) Refer to them in the singular, and treat the party as one person (roll to see if its male or female; unless there are no females in the party); and when someone does something or talks, he takes over the one body. All npcs address the person as "one" person etc. (Ripped off from Identity, but I have done this in the past with npcs, and the party loved it. However, trying it with PCs will be a challenge for the DM. If you put some forethought into it though, should be fun. Try it short term).
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