"A son cruelly banished
Despair of the daughter
Return, great avenger
With wings from the water.
—Prophecy 20 by Tycho Dodonus[src]

The Predictions of Tycho Dodonus was a book published before 1927 that captured the often poetic prophecies of Tycho Dodonus. It was known to many of the time including Yusuf Kama, Porpentina Goldstein, Torquil Travers, and Albus Dumbledore.[1][2]

When the wizarding world became aware of the existence of an Obscurial called Credence Barebone after he nearly destroyed New York in 1926, rumours began to circulate that he might be Corvus Lestrange, the lost child of the pure-blood Lestrange family who had been thought lost as a baby. Those who believed the rumours pointed to The Predictions of Tycho Dodonus as proof of their claims. One prediction in particular was noted, concering a son 'cruelly banished' (Corvus), the despair of his surviving sister (Leta Lestrange), while a 'great avenger' would return to destroy him. Yusuf Kama, the last of his own pure-blood line who had sworn an Unbreakable Vow to his dying father to kill Corvus Lestrange, believed himself to be the great avenger.[3]

The prediction was disproven to concern the Lestrange family when Leta Lestrange revealed her darkest secret: she had switched her crying brother for a quieter baby (Credence) on the boat they had been taking to the United States. Before she could reveal what had happened, the sinking boat was evacuated and Corvus drowned.


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