Do you think maybe it has something to do with the blood magic that Neal was able to do? Henry would have that blood as well. Maybe that is where the dark magic could come from?
Good point! The blood magic was introduced for a reason. I’m guessing Henry can do something magical using one of his grandpa’s items because he shares the DO’s DNA.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy