Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
this is my first guide, i gonna show you the way i play pantheon.
start with dorans blade, harass your target with spear, then when lvl 2 or 3 go for kill, if you managed to harass with spear itll be a sure kill. if things go good when around 900 gold go b and buy another 2 dorans and 2 potions. then you should already be around lvl6. dont use ulti for nothing, like going back to lane from base, save it to help other lanes or get those low health enemies runng away or waiting to b under tower. then for next item i usually go for SotO, even if you didnt get the kills at begining you probably will later, if you think you wont, then just go for youmuus.
2nd item, if soto is working and youmu done, i go for banshe, then after banshe bloodthirster, but thats already late late game. if the game goes on longer than this, get more dmg if soto didnt get full or guardians if everything going well and you need more defense.