Pantheon is an masive killer, he can kill 1000 of enemys in his way. With this build you will never be in minus if you knowe how to play league of legends. becouse of the armor penatration at the begining you will hit from the SPEAR SHOT 80~ 90 dmg later on 160 and so on... He has perfect pasive ability- block, it allows you to do the first blood with no head pain to you. Later on you can create the strategies by the help of your ulti you can last hit enemy which is running from you, you could fly to the center of the beatle and do the mass demage to them + you could penta kill them.