The secret to magic is enhancing one’s soul.
All magic is, after all, is you pitting your willpower against the universe, you demanding that the universe change some aspect of itself to suit you. Thus, the stronger your soul, the stronger your will, and the more you can make the universe do that it doesn’t want to.
Entering into a compact with an infernal creature is the quick option, years of study the long game. And some people are just born strong.
But there’s the fourth option, rarely taken.
Because the universe, for all its faults, can be talked round…