The rarity of The Hounds of Chaos is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
The Hounds of Chaos is a skin for Chaos Knight. The skin was added to the game on March 12, 2014, it was created by terra.cotta.
The Hounds of Chaos is currently one of the most popular skins, but it is rarely seen in the game due to its high price.