What exactly is this? How is magic damage taken into account? Does the attack damage on my books have any contribution, or should I just be looking for books with high levels of intel on them?
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What exactly is this? How is magic damage taken into account? Does the attack damage on my books have any contribution, or should I just be looking for books with high levels of intel on them?
Potency is a linear factor used in the damage calculation.
Yes attack damage plays a relevant role.
"Magic Damage" is a major factor in all spells, including healing and DoT effects.
Anyway, it is like SasakiNori said. For melee, the "Potency" refers to how strong it is in comparison to your auto-attack, which is potency 100 (so if your auto attack does 100 damage, a 150 potency skill will do 150 damage).
Since mages have no magical auto-attack, you can just use it to gauge the general strength of the various spells. It also lets you figure out stuff like Cure II being a lot less MP-efficient than Cure, since it is about double the cost for less than double the potency.
(Potency + Atk Power)/100 * weapon dmg seems to get pretty close to what I see floating above the mob. There seems to also be a little rng thrown in as well.
Your "RNG" is the 5% variation from your end damage value. There are also seem to be static values included which scale according to your level.