Gain 10% CDR when you reach level 10. Excess CDR becomes AP or AD, Adaptive.
Offense
+5 AD or 9 AP
Flex
+5 AD or 9 AP
Defense
+8 Magic Resist
WhyElectrocute
Electrocute allows you to massively burst the enemy champion with an [E]->[Q]->Auto to deal insane damage easy kill threat.
WhySudden Impact
Zoe is able to reliably proc Sudden Impact with every cast of her R], being able to keep the Magic Penetration buff up at all time in the mid to late game for even more burst damage.
WhyEyeball Collection
This setup is all about maximizing damage and snowball potential and Eyeball Collection is all about, granting you massive AP for kills and running away with the game.
WhyRelentless Hunter
More movement speed means more time spent out on the map returning from base so you don't miss crucial CS as well as faster roams.
WhyManaflow Band
Manaflow Band's additional mana empowers your ability to repeatedly trade and poke in lane while also helping ensure your damage output in the mid game when fishing for poke.
WhyTranscendence
Transcendence's mid-game utility opens you up for more kill potential in teamfights.