Glowstone

Glowstone, only mentioned in an extra page at the end of Chapter 01, is a mineral found in the Abyss.

Description
When certain frequencies are applied to a polished Glowstone, it will produce light. It doesn't produce heat, making it an ideal light source. However, when under pressure, it will explode easily.

Uses
Glowstones are used for Delvers' Headlamps in combination of the gem itself, an iron can, an airtight glass container, a wire, a processed talon crystal, and some water.

Due to easily exploding under pressure, they can also be processed into explosives.

Trivia

 * During their fight with Bondrewd, Reg throws a Glowstone Bomb to his arm at close range.
 * The Seeker Camp is equipped with Glowstone lanterns which can be set to emit a high output if a lot of luminance is needed.
 * Glowstones processed into lanterns are the main lightsource while delving, and consist of a mineral that can only be mine in the Abyss. It glows when a constant vibration is applied, and is a dangerous item that explodes when subjected to a large impact or pressure.