Category 1 Resto Shot, extra health, extra spirit are all core. Other greens if needed in lane.
I500
I500
I500
I500
I500
I500
Category 2 Everything before bullet armor is core, USUALLY buy left to right.
II1250
II1250
II1250
II1250
II1250
II1250
II1250
II1250
II1250
Category 3 Core, buy left to right. Reverb on 1. After Spiritual overflow, you can use TWO powerslashes in 1 ult. With refresher you get like 7 total minimum
III3000
III3500
IV6200
II1250
IV6200
IV6200
IV6200
IV6200
III4250
IV6200
Category 4 Generally useful but only if you have the slots for them, low prio
III3500
III3500
IV9700
II1250