Unclean umbral ash coated with excrement.
Perhaps it's possible the handmaid of Firelink Shrine could turn this into a few new things…
"Oh to savor the sweet pungency but once more…
|∞||Stalk Dung Pie||50|
|∞||Blue Bug Pellet||1500|
|∞||Blooming Purple Moss Clump||1000|
Found in the sewer entrance to Irithyll Dungeon