Bats are one of the first enemies the player encounters in Castle Hammerwatch. They are very weak, dealing minimal damage to the players, and are easily killed by most attacks. While alone they do little damage, they can easily become deadly by trapping the player and attacking them with a swarm, leading to high health loss.
- Tier One bats are the weakest bat in the game. They have very low damage, health and speed. They can be identified by their white eyes.
- Tier Two bats have red eyes. They move much faster than the normal bats and do more damage. However, they have the same amount of health as Tier One bats.
- Tier Three bats are the strongest bat in the game. They appear much later in the Campaign as they can only be summoned by the Lich Miniboss. They have significantly higher health and damage than the previous tiers, and can get even higher when the Bloodlust buff is applied by the Lich Miniboss. Without the Bloodlust buff, they are white in color with black eyes.