From Final Fantasy Wiki

Barblizzara is a White magic spell found in Final Fantasy XI. It may be learned by White mages at level 21. When cast, party members in a limited area will have a higher chance of taking no damage from Ice-based spells and taking limited damage from Ice-based attacks. It may be recast every 10 seconds, and, like all Enhancing magic, varies in effectiveness depending on the player's Enhancing magic skill.