Exploring the world of 'Overlord' for roleplaying is such a blast! I've spent hours digging through fan-made resources, and one of my favorite spots is the 'Overlord Subreddit.' The community there shares detailed maps of Nazarick, the Great Tomb, and even the surrounding New World territories. Some fans recreate floor plans with pixel-perfect accuracy, while others design custom dungeons inspired by the light novels.
For a more immersive experience, I recommend checking out DeviantArt or the 'Overlord' Wiki. Artists often upload high-quality maps with layered textures, perfect for tabletop RPGs. If you're into digital tools, Roll20 has pre-made 'Overlord' battle maps—just search by tags! The key is to blend official lore with your creativity; maybe add a hidden floor or two for your players to discover.