@ Uonatrik that's what I've been going before. Also after the devourer nerf people kinda stepped away from it. I get that CDR and armor pen's nice on warrior, but Noc is pretty AA based.

Triforce generally isn't that great on Nocturne since he doesn't really have low enough cooldowns to benefit from sheen procs.

If you're looking for burst I recommend Ghostblade over Triforce.

Yeah... don't get trinity second item unless you're insanely fed.
I haven't played Nocturne in a while, but here's my build:

Jungle Item ~> Boots ~> BoTRK ~> Randuins ~> Banshee's Veil ~> Youmuu's/Shiv/Last Whisper
OR
Jungle Item ~> Boots ~> BoTRK ~> Youmuu's ~> Randuins/Banshee's Veil ~> Shiv/Last Whisper

Depending on if you want damage or tankiness.

well I know one thing for sure, you aren't going to get far with boots. I suggest you get some lv 2 kicks for your sake.

trinity is too expensive to build so you should skip that unless you're extremely fed. You generally only need jungler item+blade and tankiness to do damage and not die.

(gets banshee's veil when you have nocturnes shield) dumbasssssssss

I like Statikk Shiv and Frozen Mallet on Nocturne

I like Ravenous on him...

i forget the names of the jungle items, but i feel botrk as your second item then tanky is the best option. Having 3 damage items on a secondary engage and front line champion falls off hard late game.