The rarity of Cicatrix Regalia is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Cicatrix Regalia is a skin for Nyx Assassin. The skin was added to the game on May 20, 2014, it was created by Nutter.
Cicatrix Regalia has been recently added to the game, which makes it rather popular with the game community.