Officer Tepios:
Interested? Then go to the Seed of Infinity, kill creatures there, and you will get Marred Soul Crystals. If you bring them to me, I'll give you 1 Freed Soul Crystal for 5 of them.
Bring me at least 50 so that we can have a reasonable exchange. Tiny sums are tiring! Also, do yourself a favor and stop when you get 500 or so.