Hi adam-lucas97! This, for me, is one of the most fun challenges in the campaign mode. Facing a sort of Final Boss, the first time I fought him, I didn't feel the defeat was unfair. It felt like a challenge that forced me to think carefully about what strategy I should use against this enemy, and when I was able to defeat him, the victory was truly satisfying. I hope SPL implements a Quest mode that is PVE with missions/final bosses like this one. Regards.
!BBH