I could use the Yellow Golden sand, which I had brought a few days ago, but I decided to use the Grey one, and the grey one is perfect for the 1st level according to the instruction written in Mystical Method.
That Grimm monster has used low-level sand to Lower the Risk of practicing, still barely able to itself from dying. To hide this shame, it had even changed the Methods name to Scourge Of Golden Sand from Domain Of Withering Sand, which was its real name.
The Grey sand is best according to the instruction of the 1st level but using it would be highly dangerous, even with the changed body, I do not have confidence that I would be able to bear the Cosmic Energy present in the sand.
This grey sand is no ordinary sand; it is the sand that is tempered with the cosmic energy for god knows how many years, it had comic energy in every part of it if even a slight mistake occurred.
