This mod aims to change the effectivness of a spell based upon the type of armour being worn, essentially the heavier your armour gets (or lighter) the less or more effective your spells become. 

So for example, wearing no armour will increase the "flames" spell to 10 damage per second whilist wearing full iron results in only 6 damage per second.
This means you as a user will have to choose between having a greater amount of armour, or higher DPS. 

Also:
Requires SKSE, which means this willn't work on Special Edition.