A Mere or Merecaster is a special kind of numenera. Merecasters allow the Last Castoff to enter the memories of other castoffs and alter them, however doing so retroactively alters history so that the castoff the Mere is from did what the Last Castoff wanted. This can alter the castoffs memories, although they will possess both sets of memories from before and after the changes, or even kill them in the past so they do not exist in the present. Using a Mere can create a Lacunae of a castoff inside the Castoff's Labyrinth.

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