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Oun-mAa Niye Ressoot 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 Medjay Bayek, where he activated the vault's pedestal, which in turn started a recording made by the Isu ninety-three days after the Great Catastrophe intended for Layla Hassan, who was reliving Bayek's memories in 2017.

Reference

 * Assassin's Creed: Origins