has anyone tried this dust o.o

I don't even get how the link skill works.

If you're level 120, the link skill can give you a random amount of STR, Dex, Int, and Luk, and Wep/Magic attack that can range from 1-20, and the number changes every 24 hours.
You can use the dust to change the values now instead of waiting the full 24 hours. And there is also a dust that extends the time it resets to 7 days.