Let the Obsession begin. Again. This time, the entire forces of the netherworld have overrun Earth. To save her, you must descend into the stygian depths of Hell itself! Battle mightier, nastier, deadlier demons and monsters. Use more powerful weapons. Survive more mind-blowing explosions and more of the bloodiest, fiercest, most awesome blastfest ever! Play DOOM II solo, with two people over a modem, or with up to four players over a LAN (supporting IPX protocol). No matter which way you choose, get ready for adrenaline-pumping, action-packed excitement that's sure to give your heart a real workout.
Khorus is a 9-level wad, in which you should battle against evil in woods and deserts, caves and vaults, the ancient abandoned temples and catacombs of the forgotten civilisation (that has some related roots with the ancient Egypt's one), and all it - while listening to Russian folk music, or later motives close to them (with a possible small exception). You will learn, why nobody likes cyberdemon's voice, also you will take part in the search of our hero's missing red cow, and feel the Mastermind's wrath, who couldn't expect that despite numerous and difficult traps, prepared for you, nevertheless, you'll break into his den to make the court of Doom come true.
Very interesting.
The environments and gameplay reminds me of Hexen.