Description
This hammer has an inlaid core of solid metal and as such is incredibly heavy and cumbersome to swing. However - impacts from this hammer has the additional effect of sapping the stamina from its target.
Notes
Can randomly be found inside a chest under The Black Galleon or outside the "levers door" near The Den.
Source
The item can be looted from the following NPCs 
:
See Also
Repair
Unique items cannot be repaired.
Dismantle
The Hammer of the Whale can be dismantled using the 
Dismantling Bench to recover the following materials:
For slightly more materials, you can use the 
Improved Dismantling Bench: