This is my first build i made.
I am not good making guide, so don't blame me plz, this is just a try :D
This guide is my way to jungle with nocturne.

Nocturne is a champion made for jungling. He is fast, does a ton of dmg and has enough life steal to survive.

Yellow armor: It's for that little bit of defense for the minions in jungle.
Blue: I took attack speed in blue because i love attack speed, it will allow me to hit&jungle faster, so more lifesteal.

Why not magic resist? It's because in jungle, minions won't do many magic dmg. And since you are in jungle, the ap champions won't be able to hit you.
You still got your shield to block the most of the ap champions their skills. Since those first skills are almost always the stuns or slows,... you will be able to take them down and steal the hp they try to take from you.

I built Nocturne very offensive. Even Magic penetration for you horror. Imo the minion hits in the masteries are worthless.

Yes, most of the ppl will ask: why not Youmuu's ghostblade?
Well, i believe, nocturne can use that item, but it isn't my favorite.
It's because of 2 things:
1. you have to activated it. It happens (yes to me :s) alot that i just forget to activated it.
2. It just takes 8 seconds, in teamfight, it can take longer then 8 seconds b4 the fight is over. And when som1 is running, you blade will turn off, and you lose the effect when you are chasing him.

That's why i prefere to take phantomdancer fast to have movementspeed and attack speed over the whole game.

Duskbringer & the shield are the most important skills of nocturne in jungle.
Duskbringer allows you to hit harder, so you can clear the jungle pritty fast.
And the shield allaows you to hit faster( the passive ).
Since nocturne isn't a ap champion, your horror skill is only usefull to fear your enemy. So just 1 lvl in horror is good enough.

I say again, this is just a fast try how guide work in mobafire :o.
Don't blame me for bad explaining or smthg :s It's just a try-out.
Anyways, ty for readying this guide, and if ppl like it, i will take more time to finish it and explain my meanings :D

Greetings