Grognak's axe (Fallout 4)

Grognak's axe is a unique weapon in Fallout 4.

Locations
You can find Grognak’s Axe inside Hubris Comics. For those who haven’t unlocked it, it’s located between the Trinity Tower and Part St. Station.Once you killed all of the Ghouls in the area, you can unlock it. Make sure you have at least medium lock picking skills to open the display case.