There is a contradiction regarding Maegor in the update, as it was previously established that he was concieved without magic.
The most momentous thing you discover is clearing queen Visenya's name of slander. She had not used blood magic to conceive her son, though you doubt her detractors will think much of evidence gained by necromancy.
"You are telling me the rumors were true for once, Maegor was born of blood magic?" you ask, surprised but not angry or disturbed. If anything, you are amused. "That might perhaps explain why he was so fond of it then."