To use something on cooldown is a phrase that simply means to use it every time it becomes available. During Titan HM/EX, as a black mage, I will burn Manawall every time it comes up simply because it has a long duration (60 seconds) and can let me eat a Landslide if I want to do more damage or if I lag and don't get out in time, or if I get trapped in a bad spot by bombs during Phase 5.
attractive enmity device