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Can't seem to craft it as of the latest patch, I can recall crafting it before. It doesn't seem to recognize any of the void-tainted fish.
It appears to recognize Void-Tainted Yellow Ridgeback, which is different from all the other Void-Tainted fish in my inventory by virtue of having the "creates blood surfaces" blue description text. The others just say they will poison.
You lose the curse if you use the swornbreaker to free yourself from the god king.