I think Jafar can die, whether he’s immortal or not. Just like Rumple can die even though he’s immortal. Just need to find out what the correct tool is that will kill him.
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Nothing is impossible on OUAT. Everything has a way of repeating itself. Keeper of the Keeper tread: https://oncepodcast.com/forums/topic/official-keeper-thread-3/#post-217924