Eye of the Bedlam Bride by Matt Dinniman

The sixth book in the explosive LitRPG Dungeon Crawler Carl series Chaos reigns on the eighth floor. Coast Guard vet Carl and Princess Donut have survived longer-and climbed higher-than anyone expected in the galaxy's favorite reality show, but now the game is wide open. The task- capture six monsters and turn them into battle cards. The stronger the creature, the better the hand. But there's always a catch. To win, Carl and Donut must claim the deadliest monster of all- Shi Maria, the Bedlam Bride-once wed to a now-missing god, her very attack can shatter the mind. Capturing a monster is one thing. Taming it? That's another story entirely.