Talk:Exclusive Mastery/@comment-62.155.132.62-20151011234850/@comment-25855124-20151020015912

the Dera vandal was a reward that coincided with the karak wraith for the http://warframe.wikia.com/wiki/Operation:_Tubemen_of_Regor. Similar to the Gradivus event, only the victors weapon would be available. In this case the Grineer won, so we got Karak. Should nef anyo won, we would have the Dera instead of the Karak. The difference between the two events however, is that both weapons were given after Gradivus, the Victors weapon came pre-build with a catalyst/weapon slot, while the Losers came as a blueprint to be crafted.