ty for the advice when i have the spare time i will try to a better pantheon build

As stated above, Berserker greaves and Trinity Force does not help Pantheon, but allow me to clarify why.

Pantheon works with his skills in a way a mage would. He uses them all and then waits for cool downs. Sure, he may add in a couple of autoattacks, but his main source of damage come from his AD-scaling abilities. When you add in Trinity Force that adds stats that aren't beneficial - such as crit%, AP, atkspd, and an on-hit effect that requires casting, you waste the gold that he could spent powering up his abilities. That reason goes the same for berserker greaves, it's just a waste.

I agree with above, Trinity Force doesn't help Pantheon, it may "give everything" but not much of what Pantheon really needs. You should replace this item with a good, solid AD item such as Bloodthirster. Of course you could go for the more tanky option of Frozen Mallet, which will also give you extra AD due to your atma's impailer. Also swap bezerker's greaves for Mercury's Treads since Pantheon doesn't need AS.

And do you really need to have separate chapters for each item description?

It would be better if you were to focus more on AD and less on AS because pantheon is an AD caster and not a DPS. I would also stay away from trinity force because its a very expensive item for something that doesnt help out panth that much. The slow and movement speed is nice but its money that can be better spent. My advice would be to get an infinity edge instead. Otherwise nice guide :-)