Alchemy

You understand the reactions between all manner of reagents and can concoct alchemical items to meet your needs. You can do this using normal reagents and the Craft activity, or you can use specially prepared chemicals that allow you to craft temporary items quickly and at no cost. Over time, you can create more and more alchemical items for free, and since each of them becomes more and more powerful, you advance in power dramatically, leaving behind those who don't understand your strange science.

You gain the Alchemical Crafting feat, and you can automatically identify alchemical items that you have the formula for.