I will watch the next half of S6 but to be honest I just want it all to end now as since Season 4 it just all went to pot and Ragnars sons have made it a pain to watch, specifically Ivar and Hvitserk, they are just awful for different reasons. The guy who plays Hvitserk is just a poor and ineffective actor mixed into a weak storyline. Ivar is just badly and comically portrayed by a guy who clearly can act but is just being directed to play his character all wrong and unconvincingly.
Lagerthas death was also terribly and disrespectfully handled all in the name of "shock and controversy". To make her part of that lame-ass Hvitserk substance abuse storyline was just sad to watch. Yes, the seer said she would die at the hands of a Son of Ragnar, but they didn't have to do it in a way that basically spits on one of the most beloved characters. Vikings is not GOT and Ned Stark was killed off after a single season... not after 6 seasons.
IMO what they should have done was have someone like Ivar kill her, either in battle or by execution/burning, something that made her a martyr to the Vikings and allowed her to give her character a proper and emotional send-off. But no, the director wanted to make it "unpredictable and subvert expectations". Ugh, I wish directors would stop doing that when it almost never works in the way it's intended.