The vision behind the project is to create a “weird horror” megadungeon, that blends the standard D&D tropes with aliens and elements of sci-fi fantasy, a touch of H.P. Lovecraft, and a heaping helping of Vikings.
I proposed running a Pits & Perils game set in the Black City, but the idea didn’t really get off the ground. So now I’m suggesting the ACKS Heroic Fantasy Companion and Barbarian Conquerors of Kanahu (BCK) instead…
It would be low-magic compared to Astonishing ACKS; instead I’ll lean heavily on the new Alien Technology rules from BCK. Viking characters would be limited to ceremonial magic and I would encourage players to select warrior-types.
I’ve also got an idea of how to kick-start the campaign, which I’m not going to mention here (to avoid spoilers).