Ascending Alchemy

I've seen other alchemists come through our camp carrying interesting looking trinkets. I believe they refer to them as... "alchemist stones"? I can sense the power they radiate, but they appear fel-tainted. The herb that grows on this planet is particularly good at cleansing corruption. I use it to purify the primal sargerite that's often found amongst the herbs. I'm certain that if we used a purified sargerite with one of those stones, we could elevate the power within it.