Dreerstone

About
Dreerstone is the The Dreers equivalent of Dirt. It can only be mined with an Iron Pickaxe or better and takes a little longer to mine than Stone. Of course, a mined Dreerstone block drops itself. As it resembles the top of Mycelium, Dreerstone is commonly used to make fake Mushroom Biomes and such. It makes the same sound as walking over stone when walked over, but makes the mining and breaking sounds of dirt.

Generation
Dreerstone is used as both Dirt and Stone, commonly making large caves which are commonly home to huge swarms of Dreer Spiders. Ravines are slightly less common. These structures stop generating when within 50 blocks of one of the three cities.