[X][M] Keep the mirror
[X] Go with Zhengui and help him build his breakthrough nest on your own.
Wasn't the mirror a really good ingredient for something when we're stronger? If we're serious about starting a clan having a powerful talisman/artifact/whatever to use and hand down strikes me as being much better than some extra money now. Maybe if selling it really would actually fund the setup for our fief.
I'd at least like to see what the next bracket of sect income is before hocking off our super treasure.
Xuan Shi is better than Xiulan for this but I'd rather have a special moment between Ling Qi and Zhengui. Plus it won't win anyway