Thor, the owner of the staff.
Gríðarvölr is an iron staff forged by a Jotunn and a friend of Thor named Grid. It serves as Thor’s back up weapon. The staff is made of powerful giant forged iron.
Magnus Chase and the Gods of Asgard[]
The Sword of Summer[]
After killing Geirrod, Magnus Chase and company recover the staff from Gerroid's home and present it to Thor to use it as a back up weapon.
The Hammer of Thor[]
After regaining Mjolnir, Thor discards the staff.