Book 3: Chapter 56: Stopwatch and Unsummon
'No, think for a moment, Soph. He obviously has a way to watch us, so he's likely inferred from our wordless actions with one another that we can secretly communicate. That at least confirms he can spy on us from across planes,' Lone said telepathically before responding, "She was surprised, but she shouldn't have been. We've never tried to hide our secret communications with one another from you, just the contents. Did we succeed?"
Another thing Lone noted was that while the contract forbade Lone from sharing the contents of any question and answering sessions with the Arch Devil, Soph and Sophie weren't under the same binding and were very much so able to hear what both of them were saying.
Zel snapped his fingers and a chair of black flames appeared behind him which he quickly occupied. "You did. Assumptions can be made, of course, but I cannot, as you suspect, hear what it is you say to each other wordlessly. How many unique skills do you have?"
"Fishing for information for the one you'll hire to kill me, huh. I have seven. Who do you intend to employ to kill me?" Lone asked.
"Big information for big information. Very fair. I shall not refuse to answer this time, I am trying to sway the tendencies of an Omni Devil. What are your seven unique skills, exactly?" Zel asked as he placed his hands on a knee before crossing his legs, seemingly getting comfortable.
"Basic Regeneration, Creation Magic, True Contract Magic, Growth Accelerator, Dimensional Storage, Mental Destruction, and The Summoning Room," Lone replied honestly as the contract forced him to if he wished this session to continue. "What is the soonest possible time you expect the Omni Devil to act, assuming you can sway them?"
"Five years, give or take a couple of months, excluding any unexpected variables," Zel replied.
'So six months, maybe sooner. I have to account for those unexpected variables,' Lone thought.
He had no real basis to leap to six months, but it felt much more accurate to his instincts than five years did. He had gone from a normal human on Earth to the strength he had now in less than two, so he would likely be more than powerful enough to handle Zel and whatever he could throw at him in over twice that duration.