Coincidence?
"Is that so…"
Ryu fell into his own thoughts, still consuming food in large amounts yet speaking so clearly one would have thought he wasn't eating at all.
Ryu never worried much about the Three Pupil Clan or the Three Pupil Eclipse Sect during his first life for obvious reasons. He was the scion of the Tatsuya Clan, what did such existences matter to him? But, that didn't mean he didn't understand their ability.
The third eye of the Clan and the eye techniques cultivated by the Sect worked similar to Ryu's [Ephemeral Tapestry], but only for a single kind of qi, and only for Yin Qi in specific. This gave those with these pupils more sensitivity toward yin and greater control over it, giving them great futures as Necromancers.
This ability also helped the Clan to gather many yin treasures in their day, something that was likely a large reason for their improvement to this point in such a 'short' time.