I am horrible at the game and I can do advanced heliophage consistently with Thorn. Thorn is like the epitome of “do everything to them while nothing happens to you” archetype.
Now, I didn’t do hardcore as I usually don’t do hardcore in games in general. I do die, but doesn’t have to happen. But that said ALL my deaths were fumbles on my side. Like, being pushed or not engaging when I should have kited etc.
In my limited experience, Thorn is like seven notches above any other hero for literally every mission in the game (I might be hilariously wrong here, but just my two cents:) ).
Although I might try campaign with melee characters, I’ve seen people have success with that, though I don’t know how you defend stuff and not be overwhelmed. probably that will get clearer if I actually select a melee for a mission:)
I did do the first mission with Galilea and I died like five times because ISIC would constantly insta-gib me into the ceiling while I was flailing my sword floating 20 yards from him.