First time I can't justify SEH doing something dumb as shit😭
Why tf would he call out the Heavenly Lightning Banner's true name just because it asked him to bro. He knows it's a True Immortal treasure and he's seen it cause disaster multiple times, yet he trusted his own meager Nascent Soul level ability to read fate to decide whether it was safe or not to call its name.
Worst of all, He KNOWS the Heavenly Lightning Banner is connected by fate to a True Immortal (Yang Dujin's repeated warnings), AND that the connection is strong enough that the True Immortal typically finds the Banner around 70 years after regression (Which was coming very soon btw), AND he JUST talked with two True Immortals (Bong Ryeong and Black Dragon) about how names have a very powerful attraction to fate (which is also what Seo Hweol's whole naming project is all about and the reason SEH had Hong Fan's fate read before giving him a suitable name, aka what the whole arc has been about).
A blind dog could tell where this is going.
And if that wasn't enough, in the next chapter he goes like 'Shit shit shit, how could this happen, I even read fate'. Come on bro, could've at least played it off by saying the lightning banner had been influencing his mind or something. As it stands it was just my goat being a dumbass
PS: Yuan Li/Yu is broken asf. Just his luck that the one nascent soul stage cultivator left on the head realm was equivalent to at the very least 5 high ranked nascent soul stage elders