Looking foreword to this mod. One comment I would like to make is in regard to what you said about metal armour being strong vs fire but weak to lightning and vice versa for leather armour. Leather would protect you from flame fairly well while a metal breastplate would heat up and eventually start to cook you. Maybe just give all heavy armor a weakness to magic and light armour some magic dr it would also give amreason to go light armour as a non sneak based melee class. Also weapons made from Dragon teeth/claws would be fairly awesome