Talk:Jarvan IV/@comment-6818722-20130718074039/@comment-15562896-20130719051327

AD runes may sligthly improve (like 10 dmg) your Q/R dmg early game, but ARP scales better and also benefits your passive while AD doesn't.

Not to mention flat penetration is extremely effective against low resistances targets, and J4's Q reduces armor on top of that, so ARP runes synergize with that too.