-First build so please take it easy.

-Please DO NOT try this build if you are a new pantheon player. You will Fail Hard. Play some games with his magic regen build. You can practice what works and what doesn't.

-As an experienced Pantheon player I have tried all the builds and they all fall short to my expectations of pantheon. Here is the things I wanted when I made this build.
#1 MASSIVE NUKE DAMMAGE ( being able to jump, flurry, then spear and kill them even at full health)
#2 Survivabilty After Ult so I dont get wiped. (Boots of swiftness, Sword of the occult 20 stacks, ghost and flash are all escape routes for panth that he doesnt have so he doesnt die.)
#3 Cooldown reduction (With cd runes, brutalizer and monster buffs I almost always have cooldown reduction at 40% which is amazing to be able to jump on someone and stun every 5 seconds. ALso 20 stacks of mejias is cd reduction)
#4 Mana regen (no matter what, pantheon needs mana, so with mana regen masteries and mana regen runes its perfect for him.)
#5 Health (20 stacks of health w/ leviathan is what makes your indestructable at the end. 640 health plus %15 damage reduced.)

-When they target you,(and believe me they will target you) You have so much health, 500 speed with ghost, masteries bonus and occult bonus, flash and just pure awesomeness you get away every time. Which gives a chance for your team to DESTROY THEM when they start chasing you.

IMPORTANT: I Dont play pantheon w/ his auto attack till late game. Thats where almost all these builds go wrong. Why Build crit and attack speed if you stack attack damage on your abilities can wipe out a champion in a matter of seconds. The more damage your abilites can do the better. Until late game when you have so much lifesteal you can just sit and auto attack forever.

Leviathan
+180 Health UNIQUE Passive: Your champion gains 32 health per stack, receiving 2 stacks for a kill or 1 stack for an assist. This effect can stack 20 times; you lose a third of your stacks if you die. At 20 stacks, your champion takes 15% less damage.

Sword of the Occult
+10 Attack Damage UNIQUE Passive: Your champion gains 5 damage per stack, receiving 2 stacks for a kill or 1 stack for an assist. This effect can stack 20 times; you lose a third of your stacks if you die. At 20 stacks, your champion's movement speed is increased 15%.

Mejai's Soulstealer
+20 Ability Power UNIQUE Passive: Your champion gains 8 ability power per stack, receiving 2 stacks for a kill or 1 stack for an assist. This effect can stack 20 times; you lose a third of your stacks if you die. At 20 stacks, your champion's cooldowns are reduced by 15%.

The reason I go utility and defensive is for survivabilty.
-Mana regen is a must
-Ghost, flash cd is a must
-amour + magic resist helps.
-Ability cd reduction wins games.
-The Build will already make you do MASSIVE damage

*Spear first for farming/harrasing. Then start building the death machine.
*Get lvl 1 stun
*Then get your heartseeking strike up as fast as possible. This is your damage output for the rest of the game.
*Of course get your ult when you can
*Then get your stun up to 1.5 soncds so they will not get away.
*lastly your spear you will get up last, becuase at lvl 1 it can still do good damage becuase its the added damage that really gives it the power not the lvling it up.

1-5 Is the most crucial part of the game. I have one word for you. FARM FARM FARM. Haha I said it 3 times though. DO NOT GO FOR KILLS. You dont have any of your stacking items yet so just FARM FARM FARM. Yes... if they try to turret jump you you might as well stun them and flurry. Easy kill. But dont try to do anything fancy, because your are still ultra squishy. And you will die, Ruining the whole groove of pantheon.

6-11 ITS TIME!! haha fun part. Ult, Ult, then do it again. ITS SOOOO Easy to get kills with panths ult, and the more you practice using it the better you will be. DO NOT BE STUPID WITH YOUR ULT. Make sure you know where the enemy champs are at all times. If you see all the champs are in a different lane and an enemy champ is almost dead in the other lane, BOOM free kill. Stacks ftw. and your team will praise you for helping out.

12-17 You need kills, and good thing thats what pantheon does best. DO NOT INTIATE FIGHTS WITH YOUR ULT. You are still too squishy, wait for the tank to start taking damage then ult on the enemy champs. Tons of kills ftw.

18 By this time you have SOOO much Health and SOOOO much Damage, you can do pretty much anything you want. You own the game. The other team will start crying because of how much you are carrying. while your team is pumped up and ready to win.

*Side note, becuase you are so strong your team will start relying on you to start intiating. Which is ok Because with all the Damage you do and the added bonus of bloodthirsters lifesteal you wipe out there whole team in a matter of seconds.

*Your probably wondering "What If they start stacking armour" 2 things :
-Mejias soulsteal gives your stun effect more damage, which negates armour (can do 500 damage easily)
-Along with your ap teamates doing great damage, you do massive damage through their armour anyway. If you really want to, buy armour penetration items.

This is just a lil taste of what I do on a normal basis with Pantheon. Its fun. Also please dont be Rude, This is my first build. Constructive critisism will be appreciated.

*Stupid LoL player, im not even black! Stop being racist. Thanks!