NPC mages are bullshit. They have too much magicka, so this mod increases only NPC spell(whoops, forgot to mention it's only for NPCS) costs so that they run out of magicka in a fair amount of spells.

NPC Spell cost: 1.5x(vanilla was .5x !!! This means it used to cost them half as much to cast a spell as you do!)

thanks to this reddit post for some enlightening information on how to change these rates.

https://www.reddit.com/r/skyrimrequiem/comments/2i7ymq/why_npc_mages_are_op_and_how_to_fix_them_yourself/

The inspiration (and rage) that drove me to create this small edit was the fact that NPCs could cast the spell Ice Storm 3-5 times, killing a level 21 character focused in stamina and health in 3 hits. It made me lose like 20 minutes of progress, and I believe this nerf is for the better for all characters alike (especially the ones who may not have invested in health thinking that magicka is the way to go)