http://www.kiya1.de/images/Div_Charrun2.jpg.html

Here, not sure if I understood your question correctly - an overview about all rune sorts. I had no probs getting the large golden ones in the end area. And you can buy them there as well.

Oh, I wouldn't say you'll reach 28-52 very quickly, you need more and more XP pts for that. Please, after you've completed the game, just post your opinion then again, ok?