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So I’m looking at this plot point of this show I used to be into called Every Witch Way with the fourth season.
To try to keep it short the fourth season has a storyline in which a Cosmic Retcon more or less decanonizes the first three, and heavily alters the lives of all the characters. This altered reality ultimately becomes the new "canon" timeline in the final season, with the first three being Exiled from Continuity. What I’m wondering is if this would be a case of Alternate Timeline or Alternate Universe, since it’s a case of the show’s universe rewriting the characters lives and practically erasing the first three seasons.
For reference the entry I was planning to make would look like this. I just need to know what trope it fits better with.