Ok.Hi their guys,wats up?Now listen,i love Kass i play him a lot,i tryed sooooooo many builds on Kass that it is ridiculus.I had most succes with AP Kass but after 100000000 wins :D i got bored with him.Then i tried AD Kass and he was very fun to play but in my opinion not as strong as AP Kass :( .Then i was trying hybrid Kass ,and after a long time I found the best hybrid Kass build.AND SO YOU KNOW KASS SECOND IS CHANGED AND DOESNT DO ARMOR PEN WHEN YOOU ACTIVATE IT,IT ADDS YOU MAGIC DMG WITH EVERY HIT AND THAT IS VERY VERY VERY IMPORTANT.

For runes there is not much to say these are my standard caster runes.Glyphs and Quints you can change as you wish,but magic pen, and mana reg DONT TOUCH!

Now for masteries i got to be real with you guys i took this masteries setup from Ninja Church this dude is realy good with Kass and his guides are prety good.

Rod of ages-you are meele you need healt, mana cuz you are a caster too,and AP cuz you need it to beat the **** out of someone :D
Sorc.-do i need to explain.
malady-goes greath with your nether blade,awesom passive,and attack speed and ap is nice too.
gun blade-this item for me is an utility item,gives you some ap, some spell vamp,some lifestel,some dmg,and a active that you dont relly need it , and hey who has time to remember to activate gunblade when you are bussy laughing at opponents face cuz you pwned his little hairy ***** xDD
wits end-THIS ITEM IS MADE FOR KASSADIN!!!!!!!!!!!I will not explain this read items description in game and you will know.
Rage blade/Lich Bane-i dont belive you will make it to this item cuz you will probably win , but still this is yours to put ,bouth items are awesom :D

How for this it is important that you take heal it works great on Kass , but for other spells you have few options:
Ignite-more firepower :D
Cleanse-if you get stuned you cant riftwalk out of danger
Flash-super ninja mode with flash+riftwalk

there is only one thing here to say.
Early game just keep pokeing your opponet with null sphere dont go in action before lvl 6 and pls play smart and THAT MEANS DONT GET STUPID AND THINK THAT NO ONE CAN CATCH YOU.

PS I AM SRY FOR MY BAD ENGLISH
and this is my first guide so please comment and tell me how did i do :))))