"I wasn't turned until I was thirty, so unfortunately, I will be of no help there." He smiled, then a thought came to his mind. "I know that you and Mycroft aren't on the best of terms." They didn't outright hate each other, but John had never really quite forgiving him for trying to use him to get to his mother. "But he is Old Blood, First Blood, and he should know about these things. He has been around much longer than I. We should ask him."

"Ask me what?" Sherlock turned to see a portal, and out of it stepped Mycroft. He didn't have a pendant like Sherlock did to change his look outside the shop. He was powerful enough that he didn't need it, it seemed.