'Vikings': Ivar the Boneless made a blunder sacrificing Lagertha's doppelganger thereby fulfilling the Seer's prophecy
As of now, Lagertha is MIA (missing in action) and there are theories that she will return as a Valkyrie, a angel of death, as narrated by Freydis, Ivar's evil queen
The Seer was the closest being the people of Kattegat had when it came to communicating with the gods. But murdered in cold blood by Ivar the Boneless, his prophecies, which have been so integral in driving the plot of 'Vikings', will not be heard anymore.
However, the prophecies he made in the past still loom heavily over this season, and despite his demise, the Seer still governs the show. From Ivar's fate of a broken chariot to Hvitserk's accomplishments, there are prophecies to be fulfilled. But there is one peculiar and important prophecy that fans believe is fulfilled in the most twisted sense.