duskbringer is nocturne's most important ability. When ganking you NEED to hit the enemy with to have success in the gank it doesn't cause much damage but it gives you 55 AD while you are on the dusktrail. Since landing it sucessfully is very important you can't just use it as soon as you reach the lane (unless you have a perfect aime) so wait until the enemy to stand still or iniciate the gank and land it when he is running (more predictable where he i going to moove).

shroud of darkness is nocturne's ability shield it has a passive that gives you a lot of ATK.speed and doubles the buff if it blocks an ability try to time it to block the enemy champions most powerfull ability when engaging 1vs1; when fleeing try to block the enemy's CC abilitys

this is nocturne's delayed fear, it is irreplaçable when ganking always land it in the enemy champion imediatly (unless he has flash in that case just wait till he flash then land it) the only problem with it is that the enemy champ runs in a random direction so you need luck when using it

nocturne's ultimate ability it has many functions. You can use it to escape (but you need to have another enemy to run to), you can use it to iniciate ganks, to finish fleeing enemy's and you can just use the visibility reduction to kill enemys without beeing seen this way the enemy won't get help from the team or he will get it too late (note:doesn't work on tans or very tanky champions)

In the jungle there are 3 ways I clear it
1st: blue-wolves-wraiths-golems-red-wraiths
2nd: red-golems-wraiths-wolves-blue-wraiths
3rd (my favourite)- wolves-blue-enemy golems-camp at the enemy red untill he appears steal the red buff with smite and kill the jungler

Very simple wait for your tank to initiate then close the gap to the carry with paranoia (or the AP if he is dealing a lot more damage than the carry) lay duskbringer and unspeakable horror on him and if someone trys to protect the carry by stunning you block their ability with your shroud of darkness

I recommend smite because of the damage it deals to minions and buff, dragon and barons steals and clayvorance because it combines very well with paranoia some alternative to these spell are exaust because it really helps ganking, ghost for the extra moovement speed, or flash to keep up with enemy flashes.

this build allows you to be durable in teamfights and still have a lot of damage becaus of teh penetration offered by all his offensive items and if you finish

upgrade duskbringer 1st because it gives you AD and moovement speed for ganks, then unspeakable horror for extra fear time to improove ganks and for last shroud of darkness improove it last because in the jungle ganking power is more important then a slightly faster jungle speed.