Leif is Sacrificed
Though Ragnar brought Athelstan to die at the temple at Uppsala, it was Leif that ended up sacrifcing himself for his new Earl. The sight of slaughtered humans and animals hanging upside down still sends a chill down my spine.
Rollo Impales One-Eye
Rollo turned his back on his brother, which lead to the massive battle that opened Vikings Season 2. Fans thought Floki might die, but it was One-Eye who Rollo impaled and lifted above his head as Ragnar watched.
When Ragnar and King Horik raided England together in Vikings Season 2 Episode 3, one of the most disturbing scenes was when they used the priest for target practice. Ultimately, it was Athelstan who killed the man as an act of mercy.
Throughout its run, Vikings has given us some truly uncomfortable scenes. However, Athelstan's crucifixion is probably still at the top of my list. Here was a character we had grown to love, being tortured and potentially dying at the hands of the English. Luckily, King Ecbert arrived in time to have the ex-monk's life spared.
Lagertha Stabs Earl Sigvard
Earl Sigvard was a cruel and abusive husband. Fed up with his nasty ways, Lagertha stabbed him in the eye during dinner. It was his nephew, Einar, that dealt the death blow by beheading Sigvard. Lagertha became Earl soon afterwards.
The Blood Eagle
The blood eagle was supposedly a Viking form of execution, though it's historically disputed today. When Jarl Borg invaded Kattegat and took Ragnar's lands, he was sentenced to death via Blood Eagle. Though filmed tastefully, the thought Ragnar cut into Borg's skin along the spine, cracked his rib cage open and pulled the lungs out resting them on his back like wings was horrifying.