The Jungler's Most important stage it at the beginning of the game so I will focus mostly on early game play. Your Job is too Gank and look for Ganks. If you can't do this please don't jungle. Your Team is not there too tell you too gank.

Get you armor and health for the jungle. (pity simple)

Get boots next because it helps you gank alot better then the extra 10 damage from the long sword.

Next make Your lantern and please use your ward from it. Ward baron or dragon (Both would make you epic) and keep them up.

Next get Infinity Edge and Phantom Dancer. These are a deadly combo that will make you impossible in a 1v1 or 1v2 match.

I get Giant's Belt next and turn it into Frozen Mallet or Warmog's Armor because at this point if the other team is smart they will be focusing you. This will help you survive the first nuke and get your health up for the next if their not dead yet.

you should have won by now but if not grab Bloodthurster. I like it for the damage but mostly for the exrta life steal.

First go too the Little Golems. Use DUSKBRINGER on both of them. Hit the first once then use your potion. You can then smite and take one out. Use DUSKBRINGER again on the other one and kill it. Use another potion on your way too Wraiths.

Throw your DUSKBRINGER so it doesn't go throw the wall. (Trust me some people are idiots and blame you for being a distraction and having them die.) Also, the enemy might see it and know your position. Take out the Big one first; this will Give you the most from your passive.

Use a potion while heading too Wolves.

Go too Blue and take the big one out first. Use a health potion here too.

You should now look and see if you can gank top or Mid. If you can DO IT! You have almost full health and lots of mana from blue so you can gank now.

If there's no one ready too gank head too red. Use a potion as you attack him.

Then head too the little Golems again and use UNSPEAKABLE HORROR on the one your not attacking. Then go back too base. If there's still no need for you in the lanes go on the Counterjungle.

Greater Mark of Desolation
-More damage... What else do you say?

Greater Seal of Vitality
-I feel that more health is better then armor because it doesn't help when ganking ap. However if you change this too Greater Seal of Resilience it shouldn't hurt.

Greater Glyph of Celerity
-If you can throw your DUSKBRINGER more then why not?

Greater Quintessence of Desolation
-Please look back at Greater Mark of Desolation