I agree with you except I am a soft jungler with Nocturne. I don't take smite because I figure exhaust is a better spell to have throughout the game. I run atk spd runes because my build ends Nocturne with 105 armor and 103 mage resist. I've survived many ganks with just that. Plus that's more or less why i start with cloth armor, for the extra def. Furthermore, the atk spd helps recharge his passive quicker. Imo, I don't see ghost as a necessity for Nocturne because of the teleport ulty. As for duskbringer, with the cooldown boots I can use it every 8-9 secs.

All in all, thank you for the comment and the constructive ideas.

You jungle, yet you don't have Smite. That alone is one thing to improve, but you also run full AS runes when Nocturne essentially needs armor seals to jungle successfully. There's also no Ghost, which is almost a necessity on most jungle champs. Duskbringer can't be relied on all the time.