The rarity of Dress of the Onyx Lotus is Rare. At this moment the item is available for trade.
Dress of the Onyx Lotus is a skin for Templar Assassin. The skin was added to the game on January 23, 2015, it was created by Sith Happens.
Dress of the Onyx Lotus has been recently added to the game, which makes it rather popular with the game community.