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It has global variables but they're pretty unique, I don't know of an easier way personally to do it. I included a progress bar and an icon, use whichever one you want
The aura will only start after the buff is applied the very first time (so if you already have it you would need to wait till it re-applied to start tracking). If you /reload then the same thing applies again as the variables are lost and only created once the aura is applied.