Hi and welcome to my first guide! This is a jungling guide for Nocturne with a fair bit of survivability thrown in. It's fairly similar to Phreak's build, although I used this build at Pax East before the spotlight came out. Thank you for reading my guide, and I look forward to your comments.

Please read before you comment, and comment before you rate :D

Pros

One of the fastest junglers I have ever jungled with (around 3:40 or faster)
High-powered level 3/4 ganking with or without his E
Capable of getting red at level 3
Ult is INSANELY fun to use

Cons

VERY squishy
After you start stacking up kills, you WILL be targeted

Greater Quintessence of DesolationGreater Mark of Desolation

Quintessences
3 Greater Quintessence of Desolation Greater Quintessences of Desolation will allow you to shred through the carry/caster/squishies armor and absolutely devastate them once you've gotten into the fray
Marks
4Greater Mark of Desolation Greater Marks of Desolation for the same reason as above
5 Greater Marks of Alacrity combined with his passive and the items in this build will allow you to regenerate health while destroying everything in your path.
Seals
9 Greater Seals of Alacrity for the same reasons as listed above
Glyph
9 Greater Glyphs of Alacrity also for the same reasons

In total, this gives you 17 Armor Pen and 21% attack speed, which will allow you to absolutely tear through people early, mid and even late game.

For summoner spells, I take Smite and Flash, period.
Smite is obviously a necessity for any (successful) jungler and, as Nocturne has no escape mechanic, I believe that flash gives him the defensive ability he doesn't inherently have in his kit.

I find Flash to be a more useful escape mechanic than Ghost, as it allows you to blink over walls and he already has an inherent Ghost in his kit.

Umbra Blades - This passive is far better than the flat health gain lets on. The 120% damage can allow you to deal tons of AoE damage during team fights, and this passive is one of the reasons he is such a strong jungler/farmer.

Duskbringer - This is your prime skill. Allows you to chase through minion waves, run away in case of danger, and does a good deal of damage to boot. Can also be used to finish people off that are fleeing at low hp.

Shroud of Darkness - Sivir's Spell Shield of 'roids. Going in for a kill on that pesky Sion? If he doesn't stun you, he will die. If he does stun you, he'll die faster. That's just how Nocturne rolls :D

Unspeakable Horror - CC on an assassin? VERY strong ability. Combined with Duskbringer, foes will find it near impossible to escape this, giving you a very nice bit of free hits on your opponents, and making those attack speed runes come in handy.

Paranoia - This ability is why people will claim Nocturne is OP. MF getting ganked top with your team on the way? Paranoia while your MF reunites with your team, and suddenly your team is on top of them and you are slicing your fancy blades through the carry's neck. Can also be used to pick off fleeing champions if necessary.

The one point in W early allows Umbra Blades to proc frequently enough at blue for you to get plenty of healing to continue on. Combined with a leash, you should have around 50% health or maybe more when finishing blue, allowing for very early ganks following red.

Duskbringer is all-around a phenomenal ability: extra damage, movespeed and phase through creeps will prevent them from getting in your way as you rickroll your way to a first-blood.

Once Duskbringer is maxed, the extra CC duration from Unspeakable Horror will allow for more guaranteed kills through mid and late game.

WQQEQR

As a jungler, Nocturne really only has one VERY important item, and that is Wriggle's Lantern.
My first trip back I will generally grab Boots to facilitate a gank, or, if a gank has already been successfully accomplished and I've gained first or second blood, I will go ahead and pick up the Madred's Razors outright. This allows for incredible jungling speed, and will allow you to get to level 6 faster and do dragon with your bottom lane should the opportunity arise.

Boots, as always, are variable however I recommend Berserker's Greaves as the extra attack speed will make you a killing machine, and if you are getting CC'd you're doing it wrong anyways.

After that, depending on your successes in ganking, getting a The Brutalizer is always good, or a B. F. Sword if your gold is greater than 1850. If you seem to be dying a lot, and focused immediately in team-fights etc. I would recommend getting your GA before Black Cleaver, as your survival will allow your carry to get good damage on their team done for free.

If the game is still going on by the time you have finished Wriggle's, Brutalizer, Black Cleaver, Guardian Angel, and Banshee's Veil, turn your Brutalizer into a Youmuu's Ghostblade. If the game is STILL going on after that, you probably messed something up with my build :p But just in case, sell the Wriggle's and buy a Bloodthirster outright. The extra damage and lifesteal will keep you in fights and make you a true force to be reckoned with.

21/0/9 - Pretty standard jungle masteries, although there could be some tweaks along the line of 19/0/11 if you have mana problems or would like your neutral buffs to last longer, I personally have found great success with 21/0/9. If you have questions about what I take, let me know in the comments.

My 3:40 path through the jungle is as follows:
Start at blue with your W, have someone leash blue before you start beating up on it. Use smite here.
Move on to wolves and throw a Duskbringer at them right before you come into the alcove
Focus the big wolf until it has one hit remaining, and then swap to one of the little wolves. This allows you to get slightly more healing from Umbra Blades, and every bit helps when you want to get that level 3/4 gank.
I then move on to wraiths, and focus down the blue wraith while getting plenty of healing from my passive (remember to use Duskbringer on cooldown)
Move on to red, starting with a Duskbringer and continuing to use it on CD.
One thing to note for all new Nocturne players, make sure to be at the center of the creep pack, as your passive hits all things AROUND YOU, not just in front of you. Also remember to continuously chug potions each time one finishes, as this will keep you very healthy and good for a gank at 3 right after red.
If a lane is not yet ready to be ganked after red, head over to double golems and finish them quickly. If your health is good to go, head for a gank. If not, just head back and pick up boots.

One of the most important things to learn in order to be successful as Nocturne, is that you can NOT initiate. He is not a tanky DPS. If you play Shaco, they play slightly similar. You can choose to run parallel to your team during a team push, or simply run behind them, but you must treat your character as a squishy caster of sorts. Once a fair bit of damage has been diplaced into both team, say maybe 20% on your opponents, either Duskbringer in, or if you are too far away for some reason, use Paranoia to not only dash straight into the fray, but also to pick off their teammates that may be straggling or near the back of the fray.

March 17th - Guide written and published, section placeholder if needed.

Currently working on maxing out a full page of Nocturne wins to show off, but would love to have some community screenshots of their successes here.

Overall, Nocturne is most certainly 100% my favorite assassin in this game, and filling the very important role of jungler is just icing on the cake. His ganking potential is one of the best in the game, and his role throughout the game continues to be strong from beginning to end. Good luck, and if you have any questions post them in the comments, or add Chimeraking on League.