How is the Wastes relic obtained, and what does the X on its cost mean?

Question

Accepted Answer

The X means the Recover action cannot be used at the Wastes. You get its relic by playing a card of the site's suit there during a Search, or from a facedown adviser. When you play a Discord card at the Wastes, the relic you gain is the one at the Wastes, not a draw from the relic deck. A later playbook replaced the X with another symbol.

Oath: Chronicles of Empire & Exile

How is the Wastes relic obtained, and what does the X on its cost mean?