It's 10 stones and HUGE -- "Swamp". What does one do with it?

Rock

On defeating The Piper yesterday an item fell in my backpack.  I didn't notice it until today.  It weighs 10 stones and is called "Swamp", and in my pack it looks somewhat like a jagged green line.  When dragged somewhere else, its "drag view" looks like 10 large swamp-themed flooring tiles connected diagonally end-to-end.  Here is a view as I'm holding it outside my house:

It is too big to fit in my 18x18 house.  What do I do with the thing?

Poppy_Wilshere

I could well be wrong but I think when locked down this is actually a single, but animated tile. I think this one will give you the bubbling swamp effect.

Rock

@Poppy_Wilshere, you are absolutely correct!  I didn't even try setting it on ground because while holding it, it is bigger than the house.  But on releasing it, it collapses to a single animated tile.  Thank you.

Poppy_Wilshere

You are most welcome! Safe travels, stop by for a cake if you are ever on Europa!