(Shudder) honestly I thought nosk was the boss, but those things where you hit them in the face and they pop out and take two masks of damage probably killed me as much as nosk would.
I think I am not very far through the game. I am getting the monarch wings (double jump) today. I have defeated false knight, hornet, soul master, mantis lords.
Of all of those, the mantis lords is the best! It took me a while, but it felt amazing when I finally pulled it off. I am currently...