| Required class | Vampire |
| Power spheres | Polymorph and Travel |
| Required powers | Ears of the Bat 5+ |
This power allows the vampire to transform into a cloud of bats. While in Bat Form you become immune to mental attacks that specifically target your heart or mind, and gain 95% immunity to all other forms of mental damage. You also gain 50% immunity to crush damage, 53% to cut damage and 55% to stab damage.
While in Bat Form you will have a different inventory set, and be unable to use equipment. Your combat tables will all change to cloud tables, and your feet will provide you with a long-ranged travel technique. Your movement rate will also be increased to 66 feet per second (i.e., the fastest possible).
As your Bat Form improves, so does the size and power of your cloud. Each rank gives you +1 Size and +5000 feet travel range, and the first 20 ranks also give you +1% immunity to all forms of damage except mental (so that at rank 20 you will have 75% immunity to stab damage, 95% immunity to mental, 73% immunity to cut, 70% immunity to crush and 20% immunity to all other forms of damage).
At rank 20, you unlock the ‘merge’ and ‘split’ commands. These require you to also have rank 20 in Summon Vermin (see ‘help Summon Vermin’ for more details).