Re: how would you GM something like a "shapeshifters impersonating the PCs" situation
When this has come up over the years in face-to-face games, I've always taken advantage of a break or the end of a session to talk to the player of the possessed PC. I recall one scenario where the spirit of an ancient witch queen randomly possessed the pacifist healer in the group. The character and player were so implicitly trusted that nobody suspected anything, even when she started stepping way over the line. It lasted multiple sessions and is still talked about by the players more than 20 years later.
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