"What makes a magical system truly immersive in fantasy literature?"
Is it consistency, or how thoroughly the magic is woven into the world? Is it how deep the magic goes into a world’s belief system, or the magic system’s originality? Is it the degree of wonder generated in the reader?
Share your favorite examples of magical systems from books you've read, discuss how the rules and limitations of magic affect the story and characters, and tell us what makes certain magical systems more believable for you.
It's more believable if there are obvious limitations. Having magic with no deficits can cause the growth of plot armor.