History
Grungnir was a shapeshifter who was part of a siege on the Nornkeep. He impersonated Balder in order to get into the Norkeep and captured Karnilla. Later, when Rattusk and Balder went into the caves, he took up the guise of Balder again. He then approached Agnar. Agnar then realized that he wasn't really Balder and dodged his attack. Agnar stabbed Grungir in the chest and he reverted back to his true form after he died.[1]