Gambit is a level 70 Rune Fencer job ability in Final Fantasy XI under the Effusion category. It expends all runes harbored to reduce an enemy's elemental defense. The types of elemental defense reduced depend on the runes the player harbors. It has a recast time of 5 minutes.
A gambit is a device, action, or opening remark, typically one entailing a degree of risk, that is calculated to gain an advantage.