Mike Mann posted the following to the Ultima Dragons Facebook group:

Several years back, I was working on a Neverwinter Nights mod that was going to combine the dungeon crawliness of Underworld with an 3d/isometric viewpoint. I had based it on The Lost Vale, the Ultima 8 expansion-that-never-was.

As it’s obvious I’ll likely never rekindle the project – especially with an actual ‘Underworld 3’ in the works – I figured I’d share a piece of the promotional artwork I had created.

The image above is that promotional artwork, and is likely all that remains of the project. But I’ve set up a project entry for it, even so.