Hi guys .Well , this build isn't for showing off . And this is my first guide . Sorry if I had some grammar errors. I wasn't good enough with grammars. I'm so sorry.. By the way , I post the build is to help people . And to rebuild if there is any mistakes I've done. You can appreciate it but please don't scold that I'm a ******ed noob or something. It wasn't the best guide ever or the 'imba' guide. It's just a common guide like everyone had. I will make a AD Katarina Build soon. Hope you guys like it :)

Well for runes , I will go ....
Mark - Greater Mark Of Insight x9
Glyph - Greater Glyph Of Insight x9
Seal - Greater Seal Of Focus x9
Quintessence - Greater Quintessence Of Fortitude x3
Mark and Glyph is to make your skills damage more effective . Seal might help you on cooldown reduction . It helps a lot . Quintessence gonna help you on survival .

Masteries will go as 21/9/0 as usual . Or you can go 9/21/0 too . It depends . If you lack of survival abilities , you can go for 9/21/0 .

I will start with a boot of speed and 2 hp pots . Boot of speed might help you for early ganks . And 2 hp pots is to help you to stay in lane longer . ALWAYS solo middle . Harass them with your 'Q' and 'E' while farming . Before you return , on level 4 , you should a least kill your lane enemies 1 time . I always harass them with my skills and make their life going low . Level up to level 4 , Kill your lane enemy with half life or low . REMEMBER to use your ignite . Before you return base , you should have at LEAST 765 gold to get a Kage's Lucky pick . If you have 765 gold early , just return base and get it and teleport back . Try harass and gank your enemy . Farm and once you get another 765 gold , another Kage's Lucky Pick please. Once again , another Kage's Lucky Pick . Yes , 3 Kage's Lucky Pick . Everyone was like 'WTF? 3 kage's lucky pick? are he mad or a noob?' . No .. This works well with Katarina . With a bonus of 25 AP each Kage's Lucky Pick , you will have like 75 AP . AND the extra gold is AMAZING . With this , you can try gank before you get your Rylai's Crystal Scepter . Next item would be .. Either a Giant's Belt or a Sorcerer Shoes . Your choice . But I'll like Giant's Belt first for the survival abilities . After done with your Giant's Belt and Sorcerer Shoes , you will need to complete your Rylai's Crystal Scepter . This scepter help you ALOT! Your skills gain slow . And this works perfect for Katarina . Because Katarina's ultimate have short range . This scepter help you on your ulti , survival and AP . Next ... Your item should be Rabadon's Deathcap . But first get a Needlessly Rod first . Then upgrade it to a Deathcap. Deathfire Cap is your next item . Helps your alot with spamming your skills . 15% COOLDOWN REDUCTION! This is really awesome . 'Why not Mejai's Soulstealer? It have 15% cooldown reduction on 20 stacks.' No , Mejai's Soulstealer is a cheap item . But .. You might sacrifice your life in a team fights . So don't get it . It's a waste . Abyssal Scepter is next .. No much to say . Just Magic Pen . And last item would be Banshee's Veil . Helps you from blocking some stuns or airborne when you ulti-ing.

No much to say . Ignite and Teleport . Ignite for early ganks . Teleport for shopping and ganking :D

Pro :
Specialize in team fight
Brings your team to victory!
'1 ulti = all dies'
Good Ultimate
Great AoE damage
Good Harasser
Good Farmer
Most awesome Passive Skill..

Cons :
Squishy... Low HP( items might help you abit)
Ultimate might stop by stunning or airborne
Enemies might aim you for 'Bringing Team to victory'

No much to say... Jungling is a bad idea . Her skills doesn't seems help her on jungling .. So ... NO .. Yeah , always take mid lane .

WOAH! Team Working are best for Katarina . She's gonna jump to the battlefield and kills everyone while saving your allies.

Katarina is a good farmer. No much to worry . 'Q' and 'E' is a good farming skill . If your mid lane enemy harass you , DON'T worry!! You got 'Q' and 'E' for harass them MORE then them doing it on you.

Well , I did not hope to get 'BEST KATARINA BUILD EVER' or 'YOU ARE GREAT ! IMBA!' from peoples because I'm not here to showing off my Katarina or something.. Just to help people who are new to Katarina and rebuild my mistakes here. By the way , GOOD LUCK ! THANKS FOR READING!