Skarner is, in my opinion, the best initiator/support jungler in the game. your main objective when playing this champion is to get your carries and top lane fed. As you will notice from the build you will likely be doing very little damage by the time the game ends (unless it goes into late game and you are fed enough to the point where you have your T-force and Gunblade) because the game will likely end before you get to your damage items, IF you play correctly and have semi competent teammates.

Skarner is one of the fastest junglers in the game. I often find that by the time I get to my last jungle pack (red buff) I have to wait up to 10 seconds before my smite is off cooldown from blue. Why you ask? Because Skarnar is a lean, mean, jungling machine.

Your jungle order goes as follows

Wolves --> blue --> wraiths --> golems --> red buff --> gank ?

your first gank is very important, if you have a sucessful one you will be able to get your philo, boots, a ward and health pot on your first back. This allows you to gank lanes back to back.

So in the case of a sucessful gank ending in a kill for you or a teammate you go back and buy the items listen above.