The rarity of Chitinous Stalker is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Chitinous Stalker is a skin for Nyx Assassin. The skin was added to the game on May 17, 2017, it was created by Hudston.
Chitinous Stalker is currently one of the most popular skins, but it is rarely seen in the game due to its high price.