Striking a Deal with My Assassin

Klaus studied Luna's reactions for a while before continuing his questions. At first, he thought she was part of the Dark Order, but it turned out she was only a proxy for Assassin Number 7—her mother. This meant she wasn't useful if his goal was to infiltrate the organization at a deeper level.

He needed someone with more influence, but since she didn't have strong ties to the Dark Order, she was practically useless to him—yet, at the moment, she was still his best asset.

Klaus, being only a Level 8 Master, had no business getting tangled with Sovereigns or even Transcendents. From what he'd learned from Cynthia Ross, Assassins Number 49 through 11 were all Great Sages, just like Luna. 

He knew he couldn't underestimate them. Luna had nearly killed him back in the Demon's Abode, and he understood that if there had been more than one of her, he would've been injured or worse, died.