The Gates of Atlantis

The Gates of Atlantis was a virtual representation of one of Kassandra's genetic memories, relived by Layla Hassan through the Portable Animus HR-8.5.

Description
Through Pythagoras, Kassandra learned of the locked vaults in Atlantis. She was tasked with traveling the Greek world searching for the powerful Artifacts that would unlock the mysterious chambers.

Outcome
Kassandra recovered the four artifacts from Boeotia, Kythera, Lesbos and Messara respectively.

Reference

 * Assassin's Creed: Odyssey