Eira Frostsinger was a powerful Gemmeran sorceress who created Maugrim.[1]
Biography
When the Nilfgaardian Army marched into the capital and claimed Gemmera as part of the Empire, Eira fled into the mountains. There, she created a monster that looked like a large werewolf which she named Maugrim. It started to attack folk outside the capital, then the guards who were sent to access, and then finally eleven of the twelve heavy warriors armed with torrwrs who were sent to investigate the trail of blood. The surviving soldier was told by Eira that she demanded the king throw out the Nilfgaardians, otherwise she would rain hell on the land.
The king hired a Viper school witcher named Gerring of Kharkiv to solve the problem. At first, the witcher retreated feeling outmatched, though in the abandoned dwarven mine he forged a new sword, and in the night he snuck out of the cave and killed Eira in her sleep. Her head, along with the wolf's, was brought to the king the following morning.[1]