I’ve killed thousands of skorn an got nothing it’s been 2 hours now..
UPDATE: went to the new located Petra, deleted my old map fragment quest, got a newer one from her, literally killed two skorn an got a corsair!
They must drop only once a week or something.
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it's not just from skorn kills alone; its pretty much anything in dreaming city - do PE's, open chests regular & hidden chests, run ascendant challenges etc