Cosmic Dust is an item added by HermitQuest. It is used to create a Cosmic Dust Block, which is used to summon the Hermit Cubfan135. Cosmic Dust can also be used as a substitute Redstone in the world.
Cosmic Dust can be found high in Extreme Hills biomes, above the snow line. They look like small blue dots of dust, and will replace the snow layer. Snow cannot form on top of the Cosmic Dust, so it is easy to find with the assistance of a flying device.