Not Updated For Current Season
You need to stay all the time with the shield, and Attack the enemies every time with Siphon of Destruction, That it's Good if the enemies are rangeds.You can use the skill Creeping death in your creeps, This guarantees the shield from a distance if the enemies are in range, also keeps out the enemies of the creeps, with this you have all the time the shield.
With the combo "Childen of the grave" and "ignite" the enemies no have chance to escape.
Force of nature
Finally sorry for my bad English. I want to clarify that I have 13 years, and I'm from Argentina