( sorry if I spelled her name wrong) The first theory seems very real ( I did not come up with this theory if you want more info watch the YouTube video) (WARNING SPOILERS FOR HP AND FANTASTIC BEASTS AND WHERE TO FIND THEM) The theory is that Dumbledore's sister was an obscures now that we know how Credence was affected by being a obscurus if we look back on how Aberforth Dumbledore describes her we notice that it is a perfect description of a obscurial. So thats all im going to write on this because it is the basic idea but if you want more information the you should watch the youtube vid.
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Harry Potter theory's
RandomA book about all the Harry Potter therorys ive heard of