User blog comment:LikeYAbunnies/Concept Idea for Rune Tester/@comment-11616642-20140415013912/@comment-24613667-20140416220950

Numbers are still just numbers, it'd be nice to actually see the impact that new runes would have before buying them.

I just bought a bunch of armor penetration runes and, while they make my abilities do more damage, I didn't realize that minions have very little armor so now my last hitting is horrendous. Should I have known that before hand? Probably, but it would've been nice to test the runes, discover this, and then determine the optimal balance of damage and penetration before I dumped all of my IP into what I currently have.