Quote Originally Posted by miguelsalvador81 View Post
How does Elemental damage works?
A super simplified damage formula is BaseAtk*CharacterAtk*ElementalAtk.
Quote Originally Posted by miguelsalvador81 View Post
Does this affect character normal attacks damage?
Does this affect skills damage?
Does this affect Burst damage?
Yes. Yes. yes.
Quote Originally Posted by miguelsalvador81 View Post
How does skill level from weapon works?
What does it boost?
Assault is CharacterAtk, and each skill level is 0.5% more damage. Relic weapons are ElementalAtk, and each skill level is 1% more damage.

All damage is boosted - however, please note that Abilities have damage caps. If your Abilities aren't hitting harder, then you're probably at the cap of that specific Ability.
Quote Originally Posted by miguelsalvador81 View Post
What dies +xx number means on Weapons and Eidolons?
Does this number can be stacked on Kamihimes too?
Each +1 is +3 Atk and +1 HP. Yes, you can put them on Kamihime as well, but you never want to - it's much better to put them on weapons since that way, EVERYONE in your team gets that very same +3 Atk and +1 HP, not just that one Hime.