The Crab, or Big, Juicy Crab, is a giant crustacean that appears in Drakengard 3's DLC.
On Five's quest to find the Sea Treasure, she is lead to the Land of Mountains citadel. They they spot a ship moving unnaturally. The ship was revealed to be attached to the back of the Crab, who Five says is the Sea Treasure. With Gabriella's help, Five was able to kill the Crab and eat it for a meal.
The Crab has the same abilities as Phanuel, except it does not have a water blast attack. In addition, the Crab also gives birth to smaller crabs that, to a lesser extent, have the same abilities. And, just like Phanuel, it is weak to fire and vulnerable when flipped on its back.