Skul The Hero Slayer - Playthrough Part 2

I figured out that the Headless knight in the shop essentially offers you an exchange of skulls which is quite useful - you can give him an unneeded one for a more useful option. One interesting skull I discovered was a Ghost Rider inspired one, complete with summoning a flaming motorcycle as one of the skills and attacking with chains. Another was a Grim Reaper, which is huge an has a unique mechanic of harvesting souls to make itself stronger. It is so OP that it can't even be upgraded. With its help and another powerful skull called Living Armour I finally managed to defeat the Ent boss. As a reward you get to pick from a selection of items and spells. Then we get some backstory of the young boy, which I presume is Skul. He wanted to become a hero and was on friendly terms with the Demon King, who thought the boy had special powers. Skul entered the castle and the enemies there are more varied and vicious than in the forest. I eventually reached a point where you fight 2 of the minibosses you faced in the previous level at once and was defeated since it was quite challenging to keep up with both of their attacks. An Ogre I saved was back at the Demon King's castle and it gives you a random item to start with, which is a pretty neat bonus. Unfortunately you have to start from the forest again, which is expected since this is a rogue-lite, but I didn't think I had to fight the Ent again - it doesn't make sense since you freed him from the Dark Quartz. In any case after several tries I managed to beat the double mini-boss only to reach the true boss of the level - the Leiana Sisters - a duo of female knights with incredibly fast attacks, who murdered me.