Expedition 33 that you'll need to track down and send back to camp to hang out with Sastro in his little alcove at the back. These Lost Gestrals are all found on the Continent, so don't drive yourself crazy looking for them inside any of the main areas or optional locations.

Choosing which of your heroes you want to take into battle in the Gestral Village arena can actually impact your rewards in Clair Obscur: Expedition 33. After the boss fight against the mysterious “Stranger” arena combatant, the winning hero will get a special weapon or an upgrade to an existing weapon.