Sapphire-polished Drill Engine

The Sapphire-polished Drill Engine is a Drill Engine that can be obtained from forging in The Forge in the Dwarven Mines. It increases Drills' by  and  by  (secret bonus). It is the upgraded form of Titanium-Plated Drill Engine.

Obtaining
The Sapphire-polished Drill Engine can be forged once the player has reached (6). It takes 1 day and 6 hours to forge.