I can't remember ....

Which is the quest where at the end you bring a dragon bone and a dragon scale to Esbern?

And what does he do with it again?




???

It's buged. He is suppose to give you a potion that gives you dragon infusion perk, but this does not happen.

http://www.uesp.net/wiki/Skyrim:Dragon_Research

Thanks!!!

That's what I was looking for.