Obsidian

 is an ore.

Obtaining

 * Collected by a Miner (Lv. 100) from
 * Obsidian veins

Uses

 * Used in the craft of
 * Key to the Royal Mostogob's Greenhouse
 * Key to the Obsidemon's Hypogeum
 * Key to the Hesperus
 * Pingwin Key
 * Pingwin Key