no way of knowing how to get soul sand

The ritual is different from the previous ritual which makes click machine. I will add some description to the quest.
You can google "Eziveus' Spectral Compulsion" to know how to draw the ritual.

If there is something I missed, reply and show me where it goes wrong to your progress. :)

Oh, remember to put the sacrifice stuff first then the main item. It will refuse you to put the main item first.