What’s your favorite fantasy book/series? And why?

I love trilogies or longer. I like long books that aren't draggy. Magic systems that have well-defined rules are a plus. I also like the Stormlight archive mainly for the lore and world building. Epic fights and action are a plus.

I have read:
Mistborn
Broken Earth
Shades of Magic
Gods of Blood and Powder
Bloodsworn trilogy
Powder mage trilogy
The poppy war
Lightbringer