The rarity of Scepter of the Rat King is Mythical. At this moment the item is available for trade.
Scepter of the Rat King is a skin for Chen. The skin was added to the game on July 19, 2018, it was created by SOLMIR.
Scepter of the Rat King is currently one of the most popular skins, but it is rarely seen in the game due to its high price.