Dark Age Spoilers/ Light Bringer Spoilers and Question

I just got to the part in Dark Age where Cassious saves Darrow. I unfortunately I spoiled that Cassious dies in the next book. He’s my favorite character so I’m pissed about this. So much so that I’m thinking of taking a break. But I was wondering if it’s handled well? Like does it make sense? Should I take a break or will I understand it? I already didn’t like that he did the same thing with Alexander in this book bringing him back just to kill him