For those who have not completed Xenoblade Chronicles 2, this page may contain spoilers regarding the plot. Discretion is advised.
Sandstream can be fought twice as a quest-exclusive boss and Driver during the quest Flames of Justice. During the first encounter, he is known as the Mysterious Driver and is found at level 40 at the Uraya Merc Barracks in the Kingdom of Uraya. He is later fought as The Evil Sandstream at level 46 in Elmos Square in the Kingdom of Tantal.