The DLC contains:

Digital Artbook

Dip into Anvil Saga with over 90 pages of lovely arts, concepts, and stories behind the characters and events.

Learn more about Arthur and his relatives, friends, rivals, and customers. Meet all of the special guests with their peculiar orders, try to recognize all of the references, and uncover the ones who never made it to the release.

Please, mind that the Anvil Saga art book contains some spoilers to the game.

Original Soundtrack

Feel the Anvil Saga vibe with the 17 atmospheric tunes that will take you to good ol’ medieval times of honor, true love, tricky plots, vibrant fairs, neverending war, and plague…

To locate the DLC please follow these instructions:

After installing the DLC, you can find its files in the Steam folder for soundtracks (steamapps\music), and also listen to the audio files in the Steam Music Player.