Before Nocturne, people believed that dreams were figments of their imaginations, meaningless images that flashed through the mind when one slept. This belief was put to the test when a rash of sleep-related incidents started afflicting summoners of the League. Some would wake up screaming, terrified and beyond consolation. Some could not fall asleep, slowly going mad as the nights ticked by. Some simply never woke up. Physicians were baffled until a Field Architect happened to pass out next to a nexus on the Twisted Treeline. Witnesses said he cried out once and then stopped breathing. Immediately after, magical energy arced out from the nexus, and Nocturne appeared.

Nocturne did not take his introduction to this world kindly. He slaughtered everything he could find before summoners were able to magically confine him. After a period of intense study, League experts divined that Nocturne hunted summoners in their sleep, attacking them in a place where their magic was useless. This seemed to be his only purpose. The families of the victims demanded justice, but League officials were concerned that death might only return Nocturne to the place from which he came. They bound him to a nexus fragment, trapping him in the physical world. As punishment for his crimes, they allowed summoners to call upon Nocturne in League matches, bending his will to the summoners he hates and creating his own personal nightmare. League scholars don’t know whether he truly came from the plane of dreams, or whether there are any more like him. Some theorize that the summoning act affected the summoners subconscious minds, luring Nocturne to them in their sleep. Perhaps the most disturbing theory is that Nocturne is a person’s nightmare come to life. If this is true, they wonder, who is the dreamer?

Pros

-Farming ability is great amongst other heroes
-Can chase really well for kills needed without risk of kill loss or tower dive
-Damage capability is really high
-One of the best ganker champs
-Damage output mixes well with speed and health in this build
-Passive is among the best with high damage and lifesteal


Cons

-Squishy beginning to mid game
-Target in team fights
-Range of ult can be depressing and champs moving out of range
-Vulnerable to CC

Honestly, on of the best passive abilities I have ever seen. It makes jungling much more easier (in my opinion it would be impossible to jungle with Nocturne without that passive). The more attack speed you get, the more frequently that passive procs. The more attack damage you have from items, the more damage that passive deals. And it heals you for a flat amount of health for every target in range!

First skill you will max. It deals nice damage based on your AD, it can be used to catch up to your target (because enemy champions hit by it leave a trail behind them) or run away from a gank. It can also help you to get back faster to your lane from base. It is a skill shot, so it's nice to practise it vs bots just to be sure that you won't miss in in real games. Did I mention that you get bonus AD if you are on the trail of Duskbringer? No? Ok, now you know it;)

Passively it gives you attack speed. But most important thing about the W skill is it's active! It blocks a single enemy spell and it's very similar to Sivir's Spell Shield, but it doubles the attack speed passive (if you will manage to block an enemy ability) instead of regaining mana. Imagine anger of Karthus who wants to kill you with his ultimate after a team fight. The only thing you need to do is to click W and laught at him.

The only Nocturne's ability that scales with AP. But you won't build any AP items on him. Even though the AP Ratio is 100%. Trust me, building any AP item is a waste of money. Also, damage of that spell is not the most important thing. So, what is it? Fear! Just be sure that your target won't get away from you before it gets feared. But hey, you have your Q ability, don't you? So staying close to your target won't be a problem;)

This is your bread and butter. This is what will make enemies rage quit. Just look at it's name... PARANOIA! It reduces enemy's sight radius and their ally vision (including minions, turrets and wards). The only thing enemy will see is something like 5 meters around him. But it's not the end. Nocturne can launch himself at enemy target in range and deal some nice damage. This is one of the best ganking ability ever made in this game.
This ability works extremely good when you are jungling. Why? Because enemies won't EVER know if you have your ultimate yet or if you don't. So they will be afraid of getting ganked by you all the time. It's also great when you want to kill someone who escaped team fight with low health. The enemy will never know from which side you will appear and even if his allies are coming to help or not.
Guess what! You can also escape a gank with it! For example: you want to do dragon and suddenly 3 enemies try to kill you. You can quickly use your ultimate and teleport yourself to the enemy at the bottom lane.

Paranoia > Duskbringer > Shroud of Darkness > Unspeakable Horror

Ult is most important, that's simple. But why Q and not W or E? Because Q is your main nuking skill, it makes you move faster and hit stronger.
I tried to max W as second and left E with only one point, but it can be annoying when your fear is only 1 second and enemy runs away from you. So good idea is to mix it up a little bit. 1 point in W, then in E, then second in W, second in E etc.
However, if you are a fan of big AS items, like Phantom Dancer you can max E first.
But always remember to have at least 1 point in W due to spell shield!