Geo-DEX is a Geomancy spell in Final Fantasy XI. When cast, a beneficial Geocolure effect boosts the Dexterity of all party members for as long as they are within emanation range of the caster's luopan. In order to learn this spell, the player must visit the Geomantic Reservoir located in Behemoth's Dominion as a Geomancer after having learned Indi-DEX.