Slashing Dragon is participating in 7DRL, the Seven Day Roguelike Challenge this year, and his entry for it is based on (what else?) the Stygian Abyss:

I’m working together with Exodus Destiny Dragon to create a 3D realtime dungeon crawler with procedural levels inspired on Ultima Underworld. We are using javascript.

It’s intended to relive the adventures of the Avatar at the end of Ultima IV, to get the Codex of Ultima Wisdom (and probably something more 😉 ) You’ll have to survive 8 intense levels finding weapons, items and magic spells to aid you in the way.

I am working mostly on design as well as the implementation of the level generator. My goal is to produce something similar to the levels of UW.

You can see a few samples of Exodus Destiny’s work over on his blog, and Slash has also been posting updates to the 7DRL website proper. So, for example, you can see how things are shaping up after three days of the challenge.

Additionally, Slash and his team are still debating where to source their art from:

We are considering whether using graphics from u5, u4 NES, oryx or handmade…. It would be great if we could get the graphics from monsters on ultima v dungeons (or the FM town games), but they seem VERY hard to come up with.

I don’t know if this will arrive in time to be of assistance, but I’ve gone ahead and restored the downloads to the project entry for Nytegard’s Ultima 5 Utilities. Included among these is the source code for a utility that will ostensibly extract the graphics from Ultima 5…which just might be of use to Slashing Dragon’s endeavour.