I think it would be a fair trade off to introduce a alchemy spell with less cooldown than what we currently have. It takes forever to alch stuff.

I was thinking it should cost a whopping 5 nature runes; in return it gives you a cast rate of 0.2 seconds instead of 1-1.5 or whatever it's set at now.

I'm sure the complaint here will be excess GP in-game, but if it costs enough natures I think it will balance out and may even drive up the price of natures rather than falling to near worthlessness like they have been lately.