Whence, disappearing from the constellation of the Northern Crown he would somehow reappear reborn above delta in the constellation of Cassiopeia and after incalculable eons of peregrination return an estranged avenger, a wreaker of justice on malefactors, a dark crusader, a sleeper awakened, with financial resources (by supposition) surpassing those of Rothschild or the silver king.
There are no more uses of "avenge" in the book.
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He wants to avenge the murder of his brother
You are the representative of justice here, and it is for justice to avenge those she has been unable to protect.