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Seshem.eff Er Aat is an Isu vault located in the Black Desert in Egypt. It is connected to the tomb of a Nomarch, who had his final resting place built on top of the complex's remains.
Around 48 BCE, the vault was visited by the MedjayBayek, who activated the vault's pedestal and witnessed a recording made by the Messenger. Dated ninety-three days after the Great Catastrophe, the message displayed was intended for Layla Hassan, who was reliving Bayek's memories in 2017.