Nord Hero Arrows are unobtainable Nord Hero Weapons tier of gear, which are meant to be made at the Skyforge in Whiterun after completing the final quest in The Companions quest line.
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One way to obtain the arrows in-game is to visit the Editor Smoke Test Cell, which contains every item in Skyrim. The test cell can be accessed via the console on the PC, and typing in coc QASmoke.