Increasing stamina in Aniimo is essential for efficient gameplay, as stamina is required for activities such as sprinting and flying. Players starting out with limited stamina capacity can significantly expand their stamina pool through in-game upgrades, which become particularly important for late-game activities and exploration.

The sole method to permanently increase stamina is to collect Lumin Amber from the open world and submit it to the Breezy Plains Branch. Each upgrade milestone grants a 10% stamina boost, and whilst Lumin Amber is fairly common, players will need to collect substantial amounts. Additional stamina conservation can be achieved later in the game by obtaining certain Aniimo once new areas become available.