Stillstone

Stillstone is a mineral found in Tortus.

Description
Sillstone is a glowing mineral that could neutralize Mana near it. Also, by crushing it into a powder, it could be fed to people who were afflicted with a medical condition known as "Mana Overload". If further compressed, it can be liquified. In this state, its concentration can be altered, and is more efficient to injest as compared to a powder.

It usually only forms in small quantities in Tortus' northern wastelands and inside the Gruen Desert's Grand Volcano, thus making it very valuable.