Laning Core. Ideal left to right order. Hard lane = buy situational items
Laning situational Burst with t2 scorn
Mid Game Core. Torment Pulse RUSH, then pickup t2 items
Mid Game Situational - SoP and SC imbue DIG. Buy depending on what you or your team needs
Late game trifecta Core - Phantom rush highest value for better gank potential
Late Game Situational - increase burst potential / Utility
Mo & Krill Skills Order

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Build Description
I don't own the original build, but this is an updated version of the dig and burst for my personal preferences and the current meta after the last patch.