C175 Titan's Power
Zhou Siyu was very generous and directly gifted the Titan Family's Blood Lineage Arts to Mu Qing.
In reality, she did not suffer any loss at all, because even though she had God of Damnation's memories, she was not the God of Damnation herself.
Zhou Siyu was born from a unique change, so other than possessing God of Damnation's memories, it didn't have anything to do with convenience