Let's not talk about the entire Witch Clan, but rather focus on the Ancient Great Witch, Da Yi. In the past, during the great battle between witches and demons, Da Yi, wielding a bow and an arrow, shot down nine golden crows. At that time, Da Yi's cultivation had already reached the peak of Daluo; with the passage of endless time, he likely has ascended to the rank of a Quasi-Saint.
And it is known amongst the beings of the Primordial era that the person Da Yi loved most was the Guanghan Fairy. Should he learn that Ye Xuan took the Guanghan Fairy as his wife, how could Da Yi possibly forgive Ye Xuan?
As previously mentioned, there are hierarchies within Quasi-Saints; the Quasi-Saints of the Witch Clan are utterly terrifying. Their cultivation and physical resilience are to an unimaginable extent.