hi everyone! that's build is just for 3v3 because in 5v5 u r too paper to survive a teamfight:D for the first buy a doran ring, boots of swiftness and deathfire grasp for early burst.buy hextech gunblade because of pushing and it's active is very good. for minimal resistance, buy an abyssal scepter that also improve your magic pen. if the enemy team is most AD, then buy a frozen heart (for cho'gath is better than thornmail) instead of abyssal. buy a rabadon and a lichbane because of casting spell u will be a very good pusher and will auto attack about 600 (a cloth char will die very fast) you must begin the burst with deathfire grasp, disable the target with rupture feral for more slow use the hextech gunblade active and finally eat the target:D that's my build for AP cho'gath. try it and enjoy ofcourse;)