The wallpaper is just a cropped image from the scans of the games manual found here, note these are spoilers!, Tunic is an absolutely lovely game I have been playing on my Switch and I highly recommend it to people who really enjoy the difficulty of older Nintendo games but want a more polished experience. The way the game integrates the "manual" is really intriguing

For a while I was experimenting with different plasma themes but I landed back on the good old reliable gruvbox dark theme.

Edit: my apologies for not perfectly aligning two of the images in Gimp, I forgot to press the button that aligns them horizontally and not just vertically :p