This massive adze is said to have been wielded by All-Father Annam, not as a weapon but as the tool he used to shape the various worlds of the Material Plane eons ago.
The adze has the following random properties, determined by rolling on the appropriate table in the Dungeon Master's Guide:
When a creature attunes to the adze, the artifact magically adjusts its size so that creature can wield it as a greataxe. The adze is a magic weapon that grants a +3 bonus to attack and damage rolls made with it. On a hit, the adze deals an additional 3d12 force damage. It also deals double damage to objects and structures.
As an action, you can call upon the might of the All-Father and use the adze to cast move earth or fabricate. Once this property is used, it can't be used again until the next dawn.
Creatures that are Small or Tiny have disadvantage on attack rolls with heavy weapons. A heavy weapon's size and bulk make it too large for a Small or Tiny creature to use effectively.
This weapon requires two hands to use. This property is relevant only when you attack with the weapon, not when you simply hold it.