This is the real Slaying of the Hydra where you actually slay it. Er, kinda. It's actually still around after this but...you kick its ass. Anyways this stage is a lot of using the Yashio'ori to take down 8 Hydra heads. Have fun.
It gets more powerful when less heads remain so you gotta stay on your toes. Not really that dangerous if you stay inside the weapons but make sure that all of them aren’t destroyed
