Power Always Wins.

She shrugged at his question which made him glare at her with his eyeless face. 

He told her, "No, I don't want their crap. It has potential, but potential is useless to us at this point. We have already reached the limit. What we need is actual power. Not shards of it. Especially not dead shards."

"Besides, I can't harm them. You know I already made a contract with them. Unless they break the contract, my hands are tied."

She offered him a suggestion: "You could make a trade for their shard of power. Ask them for it, and if they offer you, you can use that opportunity to act on them."

He scoffed and refused to acknowledge that suggestion with a reply. He just can't be bothered to go through all of that for something that wouldn't benefit him.