What's wrong with this?

Tap. Tap. Tap.

Each pair appeared in a spacious room that seemed to be deep underground, among endless caverns.

Depending on the phase of the moon, each had a different challenge, but all of them, without exception, needed to defeat their opponent, who was already waiting for them.

"Well, well, I confidently stood on the first platform, and it looks like I'm going to regret it soon." Luis muttered with a slight smile, combing his hair back. 

In the distance, there was a massive creature, with every breath releasing cold steam, covering its body. The creature had two long paws, massive stone wings, and red eyes capable of instilling fear in anyone.

"Mr. Luis... What is it...?" The girl beside him asked, pulling out her bow and preparing to attack.