Obsidian Stone Block

Description
s are used as building Blocks in Portal Knights.

Source
s only occur naturally by mining Obsidian Rock Clusters and Corundum fragments in the following locations:
 * The Great Scar
 * Filia's Folly
 * Pockmark Plains
 * Old Hintertown
 * The Bone Wastes
 * Tombs of the Order
 * AdderMoor

Crafting
The  is an ingredient of:
 * Refined Obsidian Block
 * Baroque Bookcase
 * Baroque Table
 * Tall Baroque Cupboard
 * Upgrade to Furnace III