Barstone is a White Magic spell found in Final Fantasy XI. It can be learnt by Red Mages at level 5 and Rune Fencers at level 4. When cast, the spell increases the player's resistance to Earth, thus increasing the likelihood for Earth-based spells and attacks being resisted. It may be recast every 10 seconds for 6 MP, and, like all Enhancing Magic, its effectiveness relies on the player's Enhancing Magic skill. White Mages have access to an upgraded version, Barstonra.