This field guide is a precious gift. I must do something for you in exchange.
The book mentions a kind of plant in Sprites' Forest that can fortify metal.
I happen to have some of that plant with me. If you bring me an Ax of Golden Dragon's Wings and a few other materials, I'll help you fortify it.
That way, I can both perform an experiment and offer you some help simultaneously. It's a win-win situation!