The Silver Vein (memory)

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

Description
The Cultists of the Silver Vein amassed wealth through war, slavery, and when that didn't work, theft. So long as they lived, the Cult would have drachmae, and lots of it.

Reference

 * Assassin's Creed: Odyssey