A memecore was a piece of Faction Paradox alter-time technology used in the construction of the Eleven-Day Empire.
Early in the War in Heaven, Goralschai recovered a memecore from Godfather Shuck on Ganda Mnemma and neglected to tell his House Military superiors. After meeting with the Celestis, Goralschai used the memecore to create the Netherweald for House Meddhoran. (PROSE: Against Nature)