Sylas' eyes opened when a familiar sloppy face appeared before him. Honestly speaking, he didn't know for certain if the Sloth would appear, but he had a good guess at it.
The Sloth wasn't exactly the only one he was waiting for. Actually, the one he was truly waiting for was the Glutton. But he hadn't appeared yet.
Sylas knew for a fact that the Glutton was a D-tier. He was able to reverse engineer the latter's strength by calculating how long it took for the Madness Key to react.
According to Fanelei, the Madness Key started reacting because it was separated from his Scorned Wraps. The longer it spent separated, the larger the area it scouted out.
This gave Sylas a radius for the region the Glutton was in. However, it also told him how power the Glutton was.
That was because the Madness Key didn't react if the strength gap was too large, or else there wouldn't be much of a point to pitting them against one another.
