The rarity of Seismic Berserker is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Seismic Berserker is a skin for Magnus. The skin was added to the game on December 7, 2015, it was created by Godzy.
Seismic Berserker is currently one of the most popular skins, but it is rarely seen in the game due to its high price.