I've been doing research on YouTube to find the best build for my sorcerer. My max magicka is ~4500, and spells like Crystal Shards cost 800 per cast. I often have trouble with 1 vs Multiple because I don't have enough magicka. In some YouTube videos I've seen, people are casting Crystal shards for 300 and Endless Fury for 150! Do spell costs decrease with level/attributes?