Muck is an Alchemy ingredient available in Vvardenfell. Speaking to either Tendris Vedran or Anarenen, both alchemists will cause the Nerevarine to learn the following: Muck is the damp, fibrous slime from crushed muckspunge plants that grow in the West Gash and on Azura's Coast. Unless properly prepared in the native manner, it is mildly toxic.