Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Top-Down Dungeons II Free.
Top-Down Dungeons II v1.0
The set contains a lot of assets designed for dungeon environments.
In the package you will find:
– almost 400 prefabs of walls, grounds, props, constructions and particles
– fully prepared materials
– mobile-friendly meshes
– hand-painted, atlased textures
– additional shaders for lava and fire
– 2 Demo Levels for review and testing.