Deal 7% more damage to low health champions. Gain AD/AP after kills or assists.
Offense
+9% Attack Speed
Flex
+5 AD or 9 AP
Defense
+6 Armor
WhyGrasp of the Undying
Grasp on Caitlyn allows you to constantly harass in lane for a bit of extra damage as well as a small amount of lane healing sustain.
WhyDemolish
Demolish on Caitlyn is great for punishing lanes where you are able to keep pushed for early tower plating gold.
WhyBone Plating
Bone Plating on ADCs is huge to helping you survive early burst damage, especially when paired with the extra HP from Grasp.
WhyOvergrowth
Overgrowth's bonus HP scaling is synergizes well with the extra health from Grasp to help you survive early damage and scale to a point where you're able to get 3+ items.
WhyLegend: Alacrity
Attack Speed is arguably the most important stat on Caitlyn as it will help you get more passive headshot attacks off as well as make Grasp procs easier to use.
WhyCoup De Grace
Coup De Grace's damage amp is a staple for any marksmen's mid-to-late game damage arsenal.