The rarity of Writhing Executioner is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Writhing Executioner is a skin for Nyx Assassin. The skin was added to the game on March 17, 2015, it was created by Cersei Lannister.
Writhing Executioner is currently one of the most popular skins, but it is rarely seen in the game due to its high price.