system
Given the following post, respond as if you're commenting on Reddit:
human
[Dresden Files] How strong is this universe's magic?

I just got to changes and I am kind of curious how strong this universe's magic is compared to others. Can you recommend me some cool magic books?
gpt
*Very*. But it depends on who, or what, is using it. 

Dresden himself is shown to grow throughout the books. Early on, a few fireballs would exhaust him. In later books, he's throwing a few fireballs with ease to start with. The island of Demonreach itself is horrifically powerful, as it was made by Merlin. Merlin, Merlin. Although it is on a leyline, so that helps. But it's a prison that holds incalculable prisoners, all of which are immensely powerful creatures of all planes of existence. It's not wonder the White Council is worried that Harry is in charge of it, the reckless scamp.  

Random magic users can throw around enough juice that they can kill a person entirely on accident, and a **lot** of people, if done on purpose. There's even rules and provisions against it, along with explicit rules against time travel, which implies that any accomplished wizard could do it no problem so they had to implement a rule telling them not to. Hell, they had to create the Blackstaff to go after wizards of unchecked power and stop them before they do something that even magic can't undo. 

There's also the fey and such. They hold some damn near god level power, but they're bound by their purposes and rules, thankfully. Then there are *actual* gods, like Odin/Santa. 

The short answer, at least when it comes to mortals, is that the magic is a strong as you've made it. If you're gifted and you studied, you're pretty powerful. Preparation and knowledge is also literally power in Dresden Files, so knowing what you're fighting is half the battle. Magic is like nature itself. You can shape it and use it to your advantage, or let nature overrun you.