Have a look at Realistic Fantasy Dungeon environment Kitbash Set for Unreal Engine that will help you create AAA quality game and VR/cinematic levels. The set features numerous tools including architecture modules, props, realistic materials and material instances, statues and details to set dress levels.

It contains a demo level, organic and modular architecture, a large set of props and details, wall and floor modules, plus treasures, skeletons, and more set dressing details.