Barthunder

Barthunder is a White Magic spell found in Final Fantasy XI. It can be learnt from a scroll by Red Mages at level 25. When cast, the spell will increase the player's resistance to the thunder-based elemental damage caused by spells, attacks and status effects. It may be recast every 10 seconds for 6 MP. Players utilising the White Mage job class have access to a stronger version, Barthundra