QSND: acts like any other liquid, only that stuff dropped into it, sinks slower than in other liquids, stickmen included.
TRND: a gas (found in the gas folder) that stretches to the ground and destroys breakable solids and moves powders and liquids back and forth while sucking them up before throwing them away.
...and how to make gray colored dust?! STNE is too heavy. And ash could be created by adding WTRV to LAVA. Pressure the mixture, and when the pressure is relased, the WTRV expands, blasting the lava into foam, or ash.
I do actually like the TRND suggestion.