"An inscription on the handle of the hatchet leads you to believe that this weapon was once possessed by the great corrupted champion Malthazar. How it ended up in your hands is something of a mystery."
Bind On PickupTierVScales With:STR 90%, DEX 65%4.0Weight3000Durability
We can't find any source for this item (quests reward, drop, etc). It's highly probable this item is not obtainable right
now.
It seems that the New Malthazar's Lost Hatchet is obtainable.