Talk:Caitlyn/@comment-16257908-20150507182310/@comment-7095057-20150605024128

Basically what MakoShiruba said. This is to help her mid-game. Cait has a rather strong early and late game still (I've been playing her a lot lately), but in the tank meta her mid game leaves a bit to be desired and it's the mid-game where she's weakest due to not yet having her LW (She normally only has IE, Vamp, and maybe the items for PD at that time if things are going decently for her). Her shift into late game starts once she has made her Shiv/PD on top of IE and Boots, and either has BFS or the items for LW. Prior to that she's in the mid game, where Randiuns Omen and the like will tear her up.

Once Cait gets her 4th item's started (Aka the BFS for Vamp) she starts becoming a bit much even for tanks when her autos start wailing on people for 1.5k+ headshots. With her ignoring 50% bonus armor this actually means a few things:

It should be noted that when Headshot is up during Laning Phase, the 50% bonus armor ignore essentially cuts the usefulness of armor per level gains in half, and at max level on squishies who dont buy armor? This cuts the 80+ armor you have at base to about 50 or lower (Aka what you have at about level 9-10).

Doing some quick math with armor the median armor gains is about 3.5 per level and champions have about 24 base armor normally. Add in the +9 from armor seals everyone runs, most champions that do not build armor gain about

17*3.5 + 9 = 63.5 Armor bonusarmor. Caitlyn ignores half on a headshot proc. So instead of being calculated as a champion with:

(63.5+24) * .94 (Devestating Strikes Mastery) = 82.25 armor or about 45% damage reduction

To

((63.5)*.5 +24) * .94 (Devestating Strikes Mastery) = 52.405 or 34% damage reduction.

This essentially equates to almost a 25% damage increase at max level when Caitlyn has headshot. She'll hit 25% harder when she has headshot up, at minimum, so it's a pretty good buff on paper.