Underworld Ascendant is a 2018 first-person action role-playing video game developed by Paul Neurath at Otherside Entertainment and published by 505 Games. It is the sequel to Ultima Underworld: The Stygian Abyss and Ultima Underworld II: Labyrinth of Worlds.
Players assume the role of the Avatar, as they return to the Stygian Abyss. As in the original games, there is an emphasis on non-linear progression, simulated systems, and emergent gameplay.
The Stygian Abyss is inhabited by three factions vying for its control, Dark Elves, Dwarves and Shamblers. The player can also encounter non-player characters of no factional alignment. Supporting any faction will affect the balance of power in the Abyss, and how factions react to the player
Underworld Ascendant is scheduled for release on Steam for Microsoft Windows, macOS, and Linux on November 15, 2018.