nocture is a dps/tank/assasin where he can tank a good amount of damage and still dish out even more of it.

my runes builds with nocture is attack speed marks to give nocture faster jungling. health at 18 seals to help in late game magic resistance gryphs because i dont have any iteams to give him migic resistance

to make nocture in to the true late game killer and tank i start of with a vampiric scepter then i go for a straight wriggle lantern. to add some attack speed i use a berserkers greaves then i get a youmuu goustblade works well with his shroud of darkness if ativated at the same time then for more of a tankish item i get a frozen mallet then to turn my tankey side in to attack i get a atma impaler then sence i have lot of critical chance i get a infinity blade to make my self the true killer

because i start off with a vampiric scepter you can start off at wolfs or at golums but with golums you need a leash and use smite with wolfs you dont need eather then you go to waiths next if you went with wolfs you smite the blue waith then if you went wolfs you go golums if you went golums you go wolfs and go heal. then by a cloth armor and a health pot. now here is choice you can make you can get blue then red or you can gank some one first.

pros
nocture can kill any carry when you get you youmuu goustblade
his ult can make it easier to gank and to foucus out the carry
his Shroud of Darkness is good aganst the ap carry
his Shroud of Darkness and youmuu goustblade makes you a true killer
cons
he is easy to kill early game in a team fight

nocture is the best ganker with udry in the game so jungle well and kill fast