I'm slamming a lot of folks together in this one, because the first episode review is coming up fast and I'm running out of time! Anyway, the Wen Clan...

Anyway, what you need to know about this idiot is that he is the patriarch of the Wen Clan. He goes power-mad and tries to gather the pieces of the Yin Iron, a powerful elemental magical artefact, in order to solidify his rule over the cultivation clans.
The obvious power grab unites the rest of the cultivation clans against him, and he is ultimately put down...
But at what cost? (Great. The cost is great)

He talks a big game, and is exceedingly cruel, but the moment things get tough, he runs away with his tail between his legs.
I, personally, think he's jealous of the respect and admiration that Lan Wangji gets, and he's not the only one, but more on that later.
Happy news, though. He gets what's coming to him. The Wen clan really doesn't do well out of this conflict.

He obliterates a lesser clan, if I remember correctly.
He's Wen Chao's brother, I think. I don't know. I'm not even sure I have his name correctly here.
Anyway, he's probably just as bad as the rest of them.
Except Wen Qing and Wen Ning. I like them.