Siwa Vault

The Siwa vault is an Isu complex located underneath the Temple of Amun in Siwa, Egypt.

In 49 BCE, the Order of the Ancients sought to unlock the door to the vault. In their efforts to do so, they abducted the Medjay Bayek and his son Khemu, assuming that the Medjay would have knowledge of Siwa's mysteries. However, Bayek was unaware of the temple, and the following altercation resulted in the death of his son in front of the vault's gates.

Reference

 * Assassin's Creed: Origins