The Great Monkey-Killing Crab is a fairytale and a madness spirit in BLACKSOULS 2 you can find at the Billingsgate Fish Market after you’re done with chasing the Sly Monkey.
In the Billingsgate Fish Market, to get the Great Monkey-Killing Crab to appear you first need to get in front of the building that leads to the elevator for the Fuming Forest and fight the Sly Monkey. The monkey will run away and then he will be inside the building that leads to the Freezer, and after fighting him there he will be at the left side of the building that connects the Billingsgate Fish Market with the Sewers.
Once you approach him there, the Great Monkey-Killing Crab will appear and kill him in front of you, and that’s where you can initiate the fight with the crab.
Killing the Great Monkey-Killing Crab will give you the Crab and the Monkey fairytale.
