Nocturne is a very strong champion early/mid game. Late game he gets a little squishy and dies quick which is why You dont just go out and ult into their team. Nocturne is my favorite jungler because of his passive and is very easy to play.

Pros.
.High damage output
.Good jungler.
.Fun to play

Cons.
.Squishy late game
.Ultimate got nerfed to a very little range now
.You will be called a noob for pwning everyone.;)

I use this rune page because This is the best setup that i have found for him because he has little base hp armor and mr so with the armor penetration You will do loads of damage and be able to survive alot longer in the jungle.

This is just the standard 21/0/9 build for most junglers.

I get ghost instead of flash because usually my first gank i do not have boots yet and ghost gives me more distance in the long run then flash.

Start at The wraiths and smite the blue one the second that it spawns. Then rush over to wolves and then wait a few seconds until u have full hp again and smite is at 20 seconds then go for blue. At this time you will be level three and mid will only be level two so tell your mid ahead of time to let them push and you will get a easy gank and pop ghost before you come out of the brush. After that head over to red then do golems and recall. You should have enough for your madreds and boots. At this point you will start to loose xp if you keep sitting in the jungle so kill the buffs whenever they are up and gank often. You should try to get some xp and creeps at top lane as much as possible when top recalls.

Wait until your whole team has begun a teamfight and then ult At the squishy ranged ad/ap carry and destroy them and then kill whoever else is left. Gl Hf;)