Magitechnocracy of Isengard

The Magitechnocracy of Isengard (魔工国アイゼンガルド) was a country that once belonged to the parallel world.

Overview
The Magitechnocracy of Isengard was the country that held the most Gollems in the parallel world, and was earnest to advance their technology. In order to do so, the witch-king, ruler of Isengard, invaded the neighboring Kingdom of Lowe in order to take control of the Azure Ruin, a hotbed of legacy Gollems within Lowe's territory. He was assisted by Gien Greed, a former general of Lowe. Later, Touya, with the support of former Lowe soldiers and the Gardio Empire, defeated the witch-king.

However, due to the divine venom created by the evil god, the ground the country was built on began dissolving, leaving Isengard as no more than a husk of the country it once was

The fate of Isengard was a literal act of God and karma, largely due to the Witcher King's greed for lost technology.