To start off the game i grab a cloth armor and 2 health and mana potions. when i die or on low health and port back, i build wriggles lantern. After that i might jungle to get more gold and health due to my wriggles. When i got enough money i buy berserkers greaves right away. now i try to help other lanes by ganking, pushing, etc, if my lane tower is destroied. Useully my team would be winning map control and by level by now. Then just follow the item build and CRUSH the enemy team. (NOW THIS THE WAY I PLAY NOCTURNE. DONT GET PISSED IF IT DOESNT WORK FOR YOU)

I move in with paranoia then either Duskbringer or Unspeakable Horror
then just kill them.

So i take ignite becuz i love its way of finishing off people so i dont have to tower dive.

I take ghost becuz in my opinion nocturne is not good at retreating.

What i dont take with me.

Heal-I got tons of life steal already.
Flash-I dont find myself needing it much.
Revive-I have nothing to say here.
Smite-I dont usally jungle.
Fortify-Let some other support/Tank get this.
Teleport-Might come in handy some times.
Exhaust-I find this pretty handy too.
Clarity-Stick to mana potions.
Clairvoyance-Not useful.
Cleanse-Ba a man and go trough those stuns.
Promote-Again for a support champion.
Rally-Yet an another support champion spell.

If this build isnt good please no negitive comments I new at this :D