This build is amazing, and it may be a bit of a glass cannon, but it still works with almost any team. the reason i put no AP items in is because AP is only useful for unspeakable horrors, which you should only be using for a fear and not the damage. for damage you want duskbringer and your basic attack. Shroud of darkness at level 4 is mainly for the passive attackspeed, but it is also useful in case you are facing karthus or another champion with a powerful spell you can easily block.

early game, duskbringer is VERY useful to you. with this build you can middle against almost anyone, or lane. when you are at about half health or if you want a kill, throw duskbringer into the crowd and attack the caster minions. if you have umbra blades up, you should get quite a bit of health back. once you get paranoia, unless you have already killed/made them recall, the enemy should be hovering at around 300-400 health. get a little lower and bait him towards your base so he can't run away, and then pop paranoia, charge him, and fear him with unspeakable horrors. if you have enough mana, use duskbringer to keep pace and hit them until they are feared.

The way to teamfight with this build is to start the combat with a paranoia and then throw duskbringer into the fray. let the tank or heavier melee's go in first, and then follow up. throw unspeakable horror on one of the kind of squishy kind of annoying not really useful teamfighters so you can kill them when youre done with the rest of their team. the first target is their most damaging champion. The tank is your last priority. after you kill your first target your second target should be wandering around feared for you to pick off.

This build IS NOT a jungle build, it's a gank/teamfight build.