To be more precise, Aunt Liu was already beyond help even before Lu Xuan came. Even then, she was already surviving on borrowed time. She only managed to last as long as she did due to the workings of some secret arts and her frightening willpower.
"Sir… I do not understand why you would help the Liu Clan… but please, save the child… The sacred ancestor went against the odds all those years ago just to save the Holy Sun Continent… The sacred ones defended the place until the bloodline was almost extinct… He is now the last of the bloodline…" Aunt Liu continued coughing blood and her coughs got increasingly severe.
Lu Xuan lowered his voice and assured her, "Rest assured that I would protect him. No one would ever be able to hurt him again. I'd also make sure that those people pay."
Aunt Liu said slowly, "Thank you."
As she stopped coughing, her body gradually became cold.
"Aunt Liu!"
Liu Haotian cried his eyes out as he cradled Aunt Liu.