An Opportunity

Their way through the underground city had been easy, and Arthur was already thinking something was wrong. The moment an invisible monster attacked him, he knew it had started.

"Fuck!"

Without looking back, Arthur launched an elbow to whatever was behind him. There was nothing behind him.

"Did you see anything?" said Arthur.

He hoped that Sully or Kai had seen something, but it was useless. Whatever attacked him was completely invisible. How could such overpowered skill exist? It had to have a weakness for them to exploit.

"What can I do? What can I do? Maybe?"

Arthur noticed that the enemy had pulled out the knife after stabbing him, and the knife turned invisible as well, but only after a second or so, which meant there was a delay he could exploit.

The senses Arthur had as a dragon came to use as he closed both of his eyes. He focused everything on his hearing and his sixth sense. It did not attack him at first, but after Arthur waited for 5 minutes, it came.