All included files are, or have previously been, released into the public domain - CC0

No credit is required.

Included images of runes scaled to 512, 256 and 128.

The models and textures were derived from:

https://opengameart.org/content/handpainted-style-rocks - CC0 - Rubberduck

https://opengameart.org/content/molten-rock-like-thing - CC0 - Prime_8

https://opengameart.org/content/cc0-rune-icons - CC0 - AntumDeluge

The 3D version can be found here:

https://opengameart.org/content/runes-3d

Preview images:

Blender 2.83.5