Death Has Joined the Party - new D&D-based book by Rachel Aaron and Travis Bach
I love books based on Dungeons and Dragons (setting, magic systems, etc.). Like the Dragonlance books, or the Spells, Swords, & Stealth series by Drew Hayes.
However, the books are subtle about it. You can obviously tell Dragonlance is inspired by D&D but the characters aren't rolling to make a save. The turn-based combat and all the other D&D mechanics work when actually playing D&D but less so in a novel.
Until I read this. Everyone has character sheets with their stats, skills, spell slots, etc. People still rest to re-gain their spells, gain new spell slots as they level, certain spells are touch-based vs long-range, and all the usual D&D staples. Combat is still real-time though and no one is pausing to roll for initiative. There's a good balance between making a world based on D&D mechanics but still being able to write engaging battles.
After reading the book, I'd say the blurb is a bit misleading. The main plot is that the MC and his party join an annual dungeon crawl that's broadcast all around the world, ala reality TV, and the blurb mostly focuses on that. The MC's name isn't even mentioned in the blurb, let alone anyone else's. This made it seem like the book would be entirely focused about fighting through the dungeon and the characters almost an after-thought.
That wasn't the case though. The MC has a good backstory and has a well-developed personality. The book spends a lot of time fleshing out the main party, the interactions between them, etc. Tons of well-written banter, humour, quirky and interesting characters, etc.
I also liked that there was a reason for the dungeon crawl beyond the DCC-style "We got forced to join this deathgame that some advanced civilization made for entertainment, so we have to fight through the dungeon to survive". I won't spoil it but in this book, people voluntarily join the dungeon crawl and there's a greater purpose for its existence beyond just obtaining money and power for the organizers or participants.
If you're even remotely interested in D&D I'd recommend checking this one.
(I have no connection to this book or the authors, other than being a fan)