Summoner Question: Where should I spend my Myth tomes first?

[coffeerox]

The reason is because while you get more person stats going for armor first. You get more party improvement +1 your Relic since The party Limit Break strength is determined by party's weapon average.

Intelligence modifies Magic Dmg (your weapon damage), Determination does as well (although this isn't the only thing it does), and Crit doubles the final calculated number after Int/Det/Mdmg/potency resolves. The higher amount of each, the more damage you do. It's not just the weapon itself.