This object exists primarily within the Sonic X continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Ermurasium (called Harahirecon in the Japanese version) is a substance that appears in the anime series Sonic X. It is a rare type of metal that was once used by the people of Murasia.
Ermurasium is a metal that is yellow in color, making it resemble gold.
In the past, Ermurasium was used by Murasians to both create objects and supply their underground kingdom with artificial light and heat.
While on the island of the Murasians, Tanaka and Topaz stumbled upon a box made of Emurasium, which they gave it to Dr. Cadberry, who identified the box as being made of Ermurasium.
Later, when Sonic and his friends entered the underground kingdom, it was noted that the artificial sky above them was being fueled by Ermurasium.