Magic Defense Bonus is a job trait in Final Fantasy XI. It increases Magic Defense by +10, +12, +14, +16, or +18, depending on the level of the ability. Magic Defense Bonus I is obtained by White Mages at level 10 and Red Mages at level 25. Blue Mages can also obtain the ability by equipping two of the following spells: Magnetite Cloud, Ice Break, or Osmosis. This can be done as early as level 50. Magic Defense Bonus II can be obtained at White Mage level 30 and Red Mage level 45. Magic Defense Bonus III, IV, and V can only be obtained by White Mages, at levels 50, 70, and 81, respectively.