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Fate decreed they be joined. Fate doomed both of them.
*shamelessly posts art of ocs on a fan art account*
Last year I visited a museum where there was an ancient sceptre on display. On it was the carving of a bird and a fish pieced together by an arrow; apparently a symbol for the conjugation of two previously warring tribes.
I decided to borrow the motif for my two shapeshifter characters, make it into a twist on the "red string of fate" trope.