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I've been playing Final Fantasy 14 for a couple weeks now, and I'm running into something I can't seem to figure out. All my spells have a "Potency" attached to them, ranging anywhere from 20, right up to 100.

Checking a couple wikis, the best I get out of them is, "The mathematical base damage of an ability.", which doesn't really tell you much about how it actually works.

Is potency a percentage-based value? Or how does it work to apply damage to whatever it is I'm targetting?

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I don't believe that the internal damage formulae are precisely known. However, because a spell or ability with a higher potency will (barring any special outside effects) always do more damage/healing than an ability with a lower potency, potency numbers can be useful for comparing and contrasting similar abilities from one another, evaluating relative efficiency, the significance of a combo bonus, and so on. – CloudyMusic Feb 6 '14 at 20:38

The rough formula does something like this for a DRG (other classes might have slightly different variances, depending on the attack used):

Damage = (Potency/100) x [(0.0032 x Attribute + 0.4162) x (Weapon Damage) + (0.1 x Attribute – 0.3529)]

For more detailed information, take a look at this Google Doc for more detailed testing, math, and statistics behind the game's battle system.

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