Is the percentage of damage reduction added with each other?
For example My Siegfried is fighting Altria (Lancer).
Siegfried receives a 50% damage reduction because of class advantage. Then I use Siegfried's dragon slayer skill which reduces the damage from dragons by 30%. If Altria's damage is normally 1000, will the damage reduction formula be 1000/2 (because of class advantage) = 500. then 500 x 70% (because of dragon slayer skill) = 350 damage? Or will the damage be only 200 because the damage reduction is 50% +30%= 80% damage reduction?
In the case of buffs it's additive. In the case of class advantages I do think they apply the class advantage modifier as well as the class damage modifier first and then apply cumulative additive defensive buffs together.
So the number you'd get from 1000 would in fact be 350.
I would have to test it to fully confirm but from my experience this is what I've seen
