Finding full novels completely free and above board is tricky, but there are ways to get legal samples and some classics. I used to hunt for 'free PDF' but ended up on sketchy sites. Now, I lean on library apps like Libby or Hoopla—they have tons of warrior epics you can borrow digitally, and the PDF or EPUB downloads are temporary but legal. It’s essentially free with a library card. Sometimes, authors release the first book in a series for free on platforms like Amazon Kindle to hook you, so search for 'The Blade's Echo' or similar and sort by price. Project Gutenberg is another solid spot for older, public domain stuff; you can find some classic adventure tales with swordfights there, though maybe not the modern 'warrior' fantasy you’re imagining.
Another angle is checking the author’s own website. Some indie writers offer free chapters or even entire novels in PDF format as a newsletter sign-up incentive. I signed up for a few and got some decent self-published gladiator stories that way. It’s not a massive library, but it feels good supporting them directly, and the content is totally legit. Just manage expectations—you won’t get the latest Brandon Sanderson that way.