Late game skarner?

I have developed a new found love for {{champion:72}} and i do really well with him early and mid. I clear fast and counter jungle very efficiently, when i encounter enemy junglers i am usually able to kill them and if not i know not to try. However i noticed that either I play badly during late game or skarner just falls of hard late game.... So my question is, How do I play him late? I realised split pushing isn't really a strong suit of his but even with defensive items I melt during late game. Any tips are greatly appreciated.
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