Ruby Weapon is an optional boss that resides in the sand around the Gold Saucer on the world map. The player must defeat Ultimate Weapon and then fight one random battle afterward to trigger Ruby Weapon's appearance, although some players have reported Ruby Weapon not appearing at all, or that it appears but is invisible and the player can only initiate the battle by running into it by chance. Defeating Ruby Weapon in the PC version re-release unlocks the Ruby Weapon achievement. Doing so in the PlayStation 4 version earns the Ruby Render trophy.