Far above the clouds on Mount Gargantuan resides a stalwart tribe of people known as the Stanpar who still revere combat and war as penultimate art forms. They remember the Runewars of Runeterra and know that the League of Legends can only repress the rising tides of violence for so long. Each member of the tribe is bred to be a disciplined and vicious warrior, preferring to battle soldiers of either the Noxian or Demacian armies only when outnumbered at least ten to one. Stanpar warriors are trained not only to be as lethal with their bare hands as the most capable martial artists, but also to fiercely wield the many relic-weapons of the tribe. Such treasures have been handed down from generation to generation, and have harnessed the mystical nature of Runeterra in their very cores. These relic-weapons are among the most dangerous in existence - and it comes as no surprise that they have found their way to the League of Legends in the hands of Pantheon. This stone-faced warrior is a paragon of his people, his very existence an anthem of exultation to the art of combat. Pantheon found it insulting that the people of Valoran would install an organization to replace war, complete with so-called champions, without including the Stanpar. Gathering the blessings of his tribe and armed with the relics of his ancestors, he has descended on the League to show the world a true warrior. He cares not who he fights, and cares nothing for the pageantry or prestige of a League champion, but lives only for the austere glory of battle. As long as Pantheon breathes, he thirsts for another foe to vanquish.

''I was hoping they had more reinforcements.'' - Pantheon, standing amidst the pieces of a brutalized Noxian battalion.

In this guide, I will discuss two ways to play Pantheon, both with advantages and disadvantages alike. The first thing to remember, is that this is my opinion, and if you feel you could do a better guide, make one yourself.
The first way, and the way I play pantheon, is an AD build with a tiny bit of extra health for added survivablity. This build is good because it will chew through tanks and carries, and completely nukes enemies with little to no chance of escape.
The second way, and the way that might not work for everyone, is a tankish build with a bit of AD. This is a good build because with your ult, you can pretty much end team fights by just being there.

I chose to go with flat armor pen runes, scaling health runes, and Cooldown reduction runes, and Fortitude Quints because in my opinion it makes you a nuke with a bit of survivability.

For the other build, I went with flat HP runes, scaling health runes, magic resist runes, and Armor Pen quints. This works really well late game and gives a good deal of health early game.
The added armor pen helps you chew through the enemy team.

Masteries are pretty self explanatory, obviously for the AD build I went 21/0/9

And for the tankish build, I went 9/21/0

obviously, you can change this to how you see fit.

Items are really strong for the AD build, with attack speed and good damage.

Whereas with the tanky build, you have good survivability, but most likely one of the items can be exchanged for an infinity edge or a Black Cleaver.

Really focus on the Aegis, and work on improving the spear shot for easy kills early game.

Communication is key here for both builds, as pantheon is good at tower diving, and his ult allows him to change the tide of team fights with little to no effort. The stun works well for preventing escapes, and the added possibility of early game tower dives.

Obviously, Pantheon is not mana efficient, so try to avoid using abilities to kill creeps. Instead, focus on last hitting whenever possible.

DON'T!!!!!!!

By late game, your team may regard you as a KILL STEALER, but remind them that you are a nuke, and it's a team game, so deal with it. Just remember that your ult is not a good idea for 2v1 or 3v1, and if you use the AD build, don't try to take on more than one person unless you have backup. You should be great at ganking, and an excellent pusher. Just remeber to have teamates with you whenever possible.