The Monster Cave Fish is an enemy that shares the same stats with Dunkleosteus and can be deadly to small dragons. It shares spawn locations with the Dunkleosteus at the Shadow Lake and doesn't spawn anywhere else. It is a mini-boss, being a rare enemy just like Dunkleosteus. It rewards a large quantity of food for the player when eaten, cannot be killed instantly, and can be defeated by latching on its body, and shares these traits with the Dunkleosteus.
- Spawns in the same location as Dunkleosteus/Big Momma.
- Unlike Dunkleosteus, it is only found in the Shadow Lake instead of any area.