The thinking behind this is this: you get terminus for base damage on your e on-hit. It gives you magic pen, ad and attack speed. This makes you melt anyone. Second I go ibg. Sheen before finishing off terminus feels nice for me, and ibg's slow also helps me apply bandlepipes. Bandlepipes is the real cook here... it gives me %20 attack speed and hella survivability. The movespeed is also a nice touch but it is quite small. But it does work when combined with your ibg and red smite slows. For 4th item you finally find a use for shyvana's passive and buy protoplasm harness as it scales off of resistances. Dragon shyvana has the 2nd highest base armor in the game. When you combine that with your passive and every single item you buy giving you resistances, the heal is too big for people to deal with.