When Yu Yan removed the cover of the ancient chalice, the other half of Mu Lingxi's soul that was trapped inside it was finally set free.
But unfortunately, it was too late for Yu Yan to do anything to save herself anymore.
Because it was only when she released Mu Lingx's soul from being trapped, did she realized that Schoolmaster Yin actually tricked her.
Everything was a trap!
There something within the ancient chalice that was pulling her inside, and she cannot seem to escape it no matter how hard she tries to resist
When Yu Yan that it was a dead-end for her and she can no longer escape it anymore, she used every ounce of her strength and power to save the incomplete soul of her child instead.
Using life preservation means that she inherited from her ancestors, Yu Yan burned the essence of her deity blood to protect Mu Lingxi's soul and send her somewhere safe.