CAN SOME1 TELL ME DOES FEVER BENEFIT FROM AD PEN?

What?

I'd suggest you re-write and un-caps lock your Title, as it will discourage people from posting here, and will just result in downvotes. Now, to your question. As Fervor of Battle gives Attack damage, which, of course, deals Physical damage, than yes, it does benefit from Armor Penetration. I hope this helped, and Good luck!