If a skill does crushing/piercing/slashing, it gets damage reduction from armour and resistances. If a skill does fire/water/air/earth, damage gets reduced by resistances. If that isn't so, it should

Well, when I do a normal attack, I see "Absorbed: X", and when I do a skill attack, I don't, which is why it seems like skills ignore resistances. I could check the Evelyn fight again to see if Fortify works properly.
I attacked a Fortified archer with a normal attack ( 36-53 Crushing) and did 17 damage (Absorbed: 37). I then did a Rush attack (35-50) on that same cultist and did 47 damage, no absorbed. Skills ignore resistances and armour.