Hand of Fate 2

The Rebel Companion Card is unlocked when you complete all of Estrella's Encounter cards. After successfully completing the last one you unlock The Rebel which is a Platinum Companion Card replacement for her original Companion Card. This upgrade gives Estrella's pistol much higher damage.

To complete Companion Encounters you must take their Encounter Cards which are marked in the top right corner with their corresponding ribbon and then land on them during a challenge in order to attempt them. Each Companion has a quest chain relating to their specific character development that you assist with and individual encounter cards can vary from skill games, resource requirements or simple conversations to be successful. Overall not super difficult it just takes time and a little luck to complete her quest chain.

Some minor details of her quest chain are below.