Mystic Ruins (Sonic Chronicles: The Dark Brotherhood)

The Mýstic Ruins (ミスティックルーイン) is the third area that appears in Sonic Chronicles: The Dark Brotherhood. In this game, the Mystic Ruins again features as a game area, although the characters visit a more swamp-like section than those seen in Sonic Adventure.

Overview
Mystic Ruins is home to many wild animals, such as Queen Wasps, Giant Millipedes and Colossal Worms. Toxic, malodorous gases are emitted into the air by Procurator Shade's inter-dimensional Nocturnus Clan forces, in a bid to clear the area of G.U.N. soldiers. The gas is only passable by Big the Cat, who is recruited into the party in this area.

History
Along with the crumbling Knuckles Clan ruins as seen in Sonic Adventure, the Mystic Ruins now hosts one of Doctor Robotnik's abandoned bases. Said base has been taken over by the Nocturnus Clan forces, who are using it as a prison to hold Knuckles captive.

Later, Shadow the Hedgehog can be seen here when you begin your search for Dr. Eggman, and also unintentionally helps you on your quest in Chapter 3.