Nocturne, the Eternal Nightmare

Nocturne is one of my favorite ADCs. he's great at chasing, ganking, dealing a lot of damage fast, and picking up kills. along with that his passive paired with his W allows for quick clearing of minion waves and jungler camps.

Nocturne's Passive is called Umbra Blades. In my opinion, it's one of the most useful passives that an ADC could possibly have. Every 10 seconds, Nocturne slashes in a circle with his blades on a basic attack. This deals 120% damage and healing Nocturne. Along with that, Nocturne's basic attacks reduce the cooldown of Umbra Blades by 1 second each attack.

His Q is called Duskbringer. This ability shoots a shadow blade that has a trail following behind it. Any enemy that it hits takes physical damage. The trail follows any enemy champions that are hit by it and lasts for 5 seconds after the ability is used. Aditionally, while Nocturne is on the dusk trail his movement speed and attack damage is increased and he avoids unit collision. I suggest taking a point in this ability at level 1, to make harassment easier. Throughout the game, Duskbringer is a good ranged attack, so you might want to max it as soon as you can.

Shroud of Darkness is Nocturne's W. Passively, shroud of darkness increases Nocturne's attack speed starting at 20% and ending at 40%. This goes well with Nocturne's passive because of the cooldown that comes from his basic attacks. Anyway If you activate shroud of darkness, Nocturne gains a spell shield for 1.5 seconds. It completely blocks the ability (I've actually been able to block Darius' Noxian Guillotine with it). If a spell is blocked by the shield, Nocturne's passive attack speed is doubled for 5 seconds.

One of Nocturne's most useful abilities for chasing down an enemy is his E, Unspeakable Horror. This ability deals magic damage/second over 2 seconds. After these 2 seconds, the enemy it is cast on becomes feared. If the enemy goes out of range of the ability, they stop taking damage and do not become feared. If you first cast Duskbringer and hit the targeted enemy, you can quickly follow up with unspeakable horror. The movement speed boost from Duskbringer will help you keep in range while Unspeakable horror will eventually fear them, causing their escape to be delayed. This could be enough time for you to take the kill. Along with chasing, unspeakable horror is great for escaping from an enemy. If you're low on health and being chased by a close combat character, they will try to close the gap between you so that they can get the kill. As soon as they get in range, cast unspeakable horror on them. If you don't get killed in those 2 seconds,  they will become feared and you can escape.

Nocturne's ultimate is called Paranoia. When you activate it the first time, the entire screen goes dark. For allied screens, it turns blue while for enemy screens it turns red. This also causes enemy maps to become completely dark and reduces their sight radius. On second activation, Nocturne rushes to a targeted enemy and deals damage to it. The most important part of this ability is that you MAKE SURE YOU'RE IN RANGE before the first activation. Every level up, the range of this ability increases. Along with using this ability, you can immediately cast shroud of darkness after and hopefully catch an ability that could cause you to lose the kill otherwise. This ability is especially good for ganks because of the range of the dash.

In my opinion, Nocturne is a fantastic character. even without any items giving attack speed, by the time shroud of darkness is maxed he's attacking at a good rate. along with this, he has a lot of power and a wide range of abilities to control your enemies. Once he's built up, Nocturne is nearly impossible to stop.