Talk:Irelia/@comment-75.72.55.220-20120519192256/@comment-75.72.55.220-20120521001841

Though fixed true damage inveitably gets less effective as the game goes on it still takes a nice chunk out of squishies, which are going to be your primary targets anyway. Especially when you slap on a wit's end and get some good attack speed and extra on-hit damage.

And it seems to me that arpen runes rather than flat ad help with keeping your damage more threatening for longer, but of course, you're losing that early game benefit from the ad.