How is it possible?
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
I'm aware many of you are thinking this is stupid, it won't work, or this is a joke. But I am mastery 5 skarner, have loved him since I first joined league. I have used this build many times with great success.
Let's talk business
Ok, as u may know skarner q cool down is reduced when u hit enemies with aa's and works better vs champions. This build fully utilises your q. With BoTRK and devourer combined, your doing 10% of the enemies health every attack. The Nashors tooth buffs the aa's more and helps improve spell damage. And obviously trinity force for the sheen passive and all round state boost.
Just to know
I have played skarner with many builds, and am very comfortable playing him, this build may not be for skarner new comers but for those who have played him a few times before.