Dude.. Pantheon doesn't rely on attack speed. He relies on his skills and crit. I have no idea how you play pantheon but this is a troll build

This guide does utilize pantheon's talents at all. Pantheon is not an AD carry. Pantheon is an anti carry. You would be much better off building a blood thirster instead of infinity edge along with ditching that phantom dancer for if all else fails another bloodthirster or a last whisperer. you might consider atmas, brutalizer, frozen mallet, an MR item for the sake of not being the priority easy gold of their AP carry. Different boots cause you don't need the AS. I do not use anything but the doran's blade on this pantheon build. Your runes would be better of to take marks of desolation and quints of something else because the AD gained is unnoticeable mid or late game.

yeah after a few games last night i noticed the issues that my build had,so im gonnarework it soon,unfortunately the rework of starks sorta messes with what i was gonna do so ima have to wait and see what it does then redo the build. my current changes are replacing with , and with but ill probably be trying a more damagy version soon

So what is your playstyle?.An auto attacking Pantheon?.Overal items like Phantom Dancer and Madred's Bloodrazor are not good for Pantheon.You don't need that much attack speed I ensure you.Its better to focus more on AD if you are looking for damage or Atmog's for more sustain during the fight.
In general your build need more damage-Health and resistances.