Treasurite

Treasurite is an item, obtained from the Bestiary bestiary drop of Treasure Hoarders in the Dwarven Mines.

Obtaining
Obtained from Treasure Hoarders, with a 0.5% drop chance. Treasurite can be found as a Good Catch! while fishing at a secret pool in the Upper Mines, in the Dwarven Mines.
 * The drop rate of is affected by  and Bestiary.
 * The entrance is actually located in Rampart's Quarry, at coordinates -120 206 -59.
 * Be wary though, as this area spawns many Treasure Hoarders, and you will likely have to fight them back to fish.
 * With the drop chance of getting one from a Treasure Hoarder at 0.5%, players tend to farm Treasure Hoarders, instead of trying to fish, as it is usually easier, and faster.

Usage
Treasurite can be used to forge Drill Engine or Rock Gemstone in The Forge.