OK guys heres my second build on here.Here i build Katarina with ALOT OF AP. im well aware there are many kat builds like this but not one updated with the best AP items in game which help her out alot. Basically when she gets to Lvl 6 its pretty much GG for your team.

Early game you might ahve a little difficulty with first ganking but if you can get to your spot fast with the boots of speed and harass with your Q abil you will eventually kill a few creeps and lvl up to get shunpo and finish someone off from a distance.

BTW constructive criticism is always appreciated

Just some AP runes and Magic Pen runes is what you want to use. With the runes being at lvl 18, she lvls up fairly quickly due to the exp boost mastery

Your going to want mostly offense. The armor i put in helps out early game agaisnt melee just a bit. and the utility helps with being able to lvl up fast, come back alive and do work, and health regen for laning.

-boots of speed help with getting to the gank fast and harrasing early game
-Health potions definitely help you lane longer(YOU WILL NEED THESE)
-after getting enough money get the sorcerers shoes for MAG PEN.
-then go back in your lane until you get enough money to start buying at least two of the items for rylais crystal sceptre and then finish this up(the health from the sceptre helps alot!)
-after this farm in the jungle and kill creeps until you get the deathcap.
(THIS DEATHCAP WILL JUST ABOUT TEAR UP EVERYTHING)it has +155 AP and passive of +30% AP
-and if you need a boost after this just get guinsoos rageblade for AP and the AD helps with her "Q" damage output.

-Bouncing Blade and shunpo are your main abilitys.

-when you reach lvl 5 be sure to get killer instincts otherwise your other spells wont do as much damage as you want them to.

-ALWAYS HIT KILLER INSTINCTS JUST BEFORE YOU FIGHT SOMEONE TO MAKE SURE YOUR DOING MAX DAMAGE

-heres the order in which i spam my spells: i first pop killer instincts to make sure of max damage with spells. then i pop bouncing blade on them and when they finnaly realize they are getting attacked you pop shunpo and i know from personal experience fighting other kats you kinda go WTF! when she use shunpo on you. plus when they start attacking u your shunpo + killer instincts buff helps with taking less damage after you shunpo. after all this is done i pop up my ULT if i have it. usally by now they start running away if they arent already dead and thats when you hit exhaust and ignite on them to ensure that kill.

-Also when your in team fights if you get a kill her passive reduces all her cooldowns so you can double,triple, ace, rampage ETC... if you get a kill in the first place


-PLUS a little tip you can only use death lotus on champions so if an invisible character gets close to her you can tell they are close if you see your ULT highlight up and ready to use.

-Another tip i found out is you can use death lotus in a bush if a enemy champ is near you and they freak out cause they cant tell where the attack is coming from its hilarious!

Refer to my skill points section for more info but these do help out early game too if you find the enemy running away

PROS
-once you reach lvl 5 and 6 shes pretty much a strait up assassin.
-Kills tanks like slicing bread lol
-good in late game and mid game
-great farmer aand creep killer
-gets alot of gold form her passive
-you can spam the hell out of your abilities(especilly when your passive does its job)
-she attacks fast and furious


Cons
-low health and somewhat low AP early game
-not good against ranged characters
-watch out for 3(them)V 1(you)ganks