In addition, if air can pass through a space, the mist can do so without squeezing, and it can’t pass through water. It is weightless, has a flying speed of 20 feet, can hover, and can enter a hostile creature’s space and stop there. While in mist form, the vampire can’t take any actions, speak, or manipulate objects. Anything it is wearing transforms with it, but nothing it is carrying does. Its statistics, other than its size and speed, are unchanged. While in bat form, the vampire can’t speak, its walking speed is 5 feet, and it has a flying speed of 30 feet.

If the vampire isn’t in sunlight or running water, it can use its action to polymorph into a Tiny bat or a Medium cloud of mist, or back into its true form.