In each other's shoes
At the start of the next combat you and the party member to your right feel a strange sensation from the amulet. You can embrace it (counts as "one fail"; see below) or try to resist it (both make a wisdom saving throw DC15)
Outcome:
- both pass - nothing happens
- one fails - for this combat you switch body with the other member (switch character sheets) but keep your characters mind and personality
- two fails - all party are affected and for this combat their minds are transferred in the body of the player to their right (pass character sheet)