I'm almost done with everything with Skull Knight but I breezed through to about half of the story with that lady queen (forgot her name). I didn't start the other hero yet.
Also, EW5 is more challenging than Epic War 4 in my opinion because in EW5 if your hero dies once, you're defeated but in EW4 if your hero(es) die they can respawn all they want. And the only way to get defeated in EW4 is your castle or whatever gets destroyed.
I played for about an hour and honestly: disappointing. I said why on another forum topic and i'll say it again. I think epic war 4 and now epic war 5 are knock-offs of epic war 3.