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 condition known as "Mana Overload". If further compressed, it can be liquified. In this state, its concentration can be altered, and is more efficiency to injest as medicine as compared to a powder.

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