[Esther]

Okay. So. We all know that tomes only lend their full (Power + Enchants + Upgrade Levels) to spells that "match their element," and half of that value to mismatched spells. What seems unclear is how those are actually defined.

What defines the 'element' of a tome? Is it the damage type dealt by its basic attacks? Is it the page type that it's made from? For example, will a Nerif Chapter Ampeol lend its full power to lightning spells (because all Ampeols deal lightning damage) or fire spells (because it's crafted with fire pages)?

Furthermore, what defines the 'element' of a spell? Is it the damage type dealt by the spell? Is it the spell's Arcana? For example, is Kel considered a "water spell" or an "Aquarian spell?" Do you need a water tome to fully empower it, or will a zeroraid work since both water and ice fall under the Acquarian arcana?

Lastly, what defines the 'element' of a spell with a split damage type, or a spell whose damage type does not match the assumption for its Arcana?

Is something like Fleeing Spectres / Ghostwind fully empowered by a fullgust, or a hymn? Or would it be fully empowered by either tome?

What about Star Stream? It deals Light damage but its Arcana is Sylphid. Is it fully empowered by a fullgust, or a chorus?