This is my first guide in english so i will make this quickly and effective: A guide for pantheon to make him kill while not dying easly, and doesn't need snowball items like sword of the occult and stuff like that.

With this guid you wont be focused very much, because you won't be squishy and you will be able to get way easily and come back in to get all those kills.

*I'M STILL WORKING ON IT SO BE AWERE OF UPDATES

Quintessences and marks are obvious: Dealing more dmg early game and late game to squishys.

Seals of replenishment and Clarity: You need mana regen early game, that's why not all the seals are of clarity , and late game you will have Banshee's veil to get a big mana pool and still have mana regen.

Masteries are very obvius: as much damage as possible, and as much time in the lane as possible.

Core items are pretty obvious:

-Dorans blade: 100 hp 9 dmg 3% lifesteal. Survability and damage early game +lifesteal to stay longer in the lane, with the lifsteal and mana regen you have a VERY long time in your lane.

-Mercury's treads: Movement speed 2 35% less cc's. You NEED this to get out fast from those stuns, slows and stuff like that. You DON'T need movement speed 3, because panth movement speed is 330 (the fastes with YI and another champ that i dont remember) and when you really need the speed you use ghost or the Ghostblade. Don't get AS boots, buecause you are not the main auto attacker. Again you need Mercury's treads

-Youmuu's ghostbalde: 30 dmg 15% crit chance 20 ArP 15% CDR Active: You gain +20% MS and +50% AS for 4 seconds, it lat's more if you do melee attacks (60 secs CD). Not much to say, except that the active must be used to chase or take down turrets and sometimes in 1v1 when your skills are in CD and you want to crit the other champ a lot because he is low healt. Don't be afraid to waste it, it's only a 60 secs CD.

-Banshee's veil: 375 HP 375 MP 50 mr Passive: Blocks one negative spell every 30 seconds. Perfect for you as you get hp (always good), mp (not backing all the time), mr more mr to kill those nukes quickly without taking too much damage, and that awesome pasaive whit that you get now 2 shields: one for spells, the other for auto attacks or tower diving, or even on hit effects of skills like Gangplank's Parley or Ezreal's Mitstyc shot

Now we go crazy yay!

-B.F. sword x2 : 50 dmg. That's 100 more damage... hmmm... nothing more to say.

Now you choose between Bloodthirster or Infinity edge

-Bloodthirster: 60 dmg 15% lifesteal (increases up to 100 dmg and 25% lifesteal by killing minions). you will need this for meleeing lifestealers dps like Warwick or AD sion and guys like those.

-Infinity edge: 75 dmg 20 crit chance Passive: Your critical strikes now deal 250% of the damage instead of 200%. Not much to say here... you crits hit harder now, so that means that your Heartseeker strike's passive will make you deal even more dmg to them.

-Last whisper: 40 dmg 40% ArP. This is now for getting tanks with huge armor, as the flat armor penetration is not very effective against those like rammus or shen or ugly guys like those.

Well this is pretty simple, all you have to do is start with the spear shot and then your godlike heartseeker strike, then the stun, and after that you max your heartseeker strike as it is your best damage output (remember that is tricky ,,e because you deal only half damae to minions , so your enemies will be surprised when you use it with them).

Remember always the skill sequence for the ganks: (Grand skyfall if needed) Stun in , heartseeker strike, auto attack, spear shot and chase if he is running (ignite if needed). Remember that as soon as pantheon jumps, but he is still in the air you can tell him what to do when he falls, so you will try to stun the easiest target, and BOOOOM as soon as he falls he will be stuning that poor Teemo.

One thing that you must know is that your ultimate is not for dealing damage and jumping right next to you. it is to position yourself and get an unexpected doublekill.