Treasurite

Treasurite is an Legendary item, obtained from the Bestiary bestiary drop of Treasure Hoarders in the Dwarven Mines and Team Treasurite members in the Mithril Deposits; Fishing in the Upper Mines; or in chests in the Mithril Deposits.

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.
 * 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, faster, and gives Bestiary collection levels.

As of the Crystal Hollows update, it can now be obtained from loot chests and from defeating various members of Team Treasurite.

Usage
Treasurite can be used to forge Drill Engine or Rock Gemstone in The Forge. 100 of it is also needed to forge the Jasper Drill Model X.