Prince of Darkness (魔王の豪邸 Maō no gōtei, Mansion of Satan) is the 22nd Sub-Chapter in Stories of Legend added in version 2.1.0 of Nyanko Daisensou. It features 6 levels, has a Two-Star, Three-Star and Four-Star difficulty rating, and will offer 30 Cat Food upon completion.
- This sub-chapter introduces 2 new enemies into Stories of Legend.
This Sub-Chapter has six new levels.
- The Red Carpet: Buffed up Celeboodles, the Teacher Bear, THE SLOTH, and Trolly Bloggers.
- The Bathroom: R. Ost and Trolly Blogger will be spawned at a constant rate and a single, buffed Master A. will be summoned after the base is damaged.
- The VIP Room: Metal Doge's first appearance. All dog enemies will be constantly spawned, accompanying a single Dober P.D.
- Torture Room: A tricky stage that spawns a Shy Boy at the start, and will spawn Assassin Bears if you take longer than 45 seconds.
- Dictator's Garden: Pigeon de Sable will be spawned at a constant rate and when the base is damaged, Camelle, Dark Emperor Nyandam, Kory, if unlucky, a Rain D. will spawn. If not unlucky, 3 Rain Ds and a Teacher Bear will be spawned after a while, not at the start. After killing all of them, 2 Angelic Sleipnirs will spawn accompanied by Dark Otters. This is the only stage that the cat cannon cannot fully cover. The Cat Cannon Range at Max is 6000 whereas the width of this stage is 6200.
- Satan's Bedroom: Master A. and Trolly Bloggers will spawn. After attacking the base for the first time, The Face and Shy Boys will spawn. A second time, an overpowered Bore accompanied by Metal Doges will spawn. After the third time, Bun Bun Black, Dark Otters and Director Kurosawah will be spawned.
- This is one of the few Stories of Legend Chapters to have a unique map background when selecting a level.