RPG and TTRPG Novels?

So, there are a lot of TTRPGs based on good books, like the aforementioned Black Company RPGS, The One Ring, Call of Cthulhu, etc. But I think the original question was about books based on TTRPG settings. And the most successful of those is probably The Expanse series! Based on a PBP forum TTRPG that the authors played based loosely on Traveller, the book series is wildly popular and critically acclaimed, and the TV show was stellar. Ohers include Malazan Book of the Fallen, which was based on the author's D&D campaign, Riftwars, etc.