Quote Originally Posted by coffeerox View Post
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.
Individual determination, crit chance, base stat, etc. does NOT affect LB damage. The only thing that matters in LB damage is the average weapon damage of your party. If you have a lesser weapon (Relic vs Relic +1), you are lowering your group's LB damage.