Vamparic Polymorph

Prerequisite: Dhampir

You are able to control your vamparic nature and turn yourself into a bat. Once per long rest you can use an action to polymorph into a bat. While in bat form you can't speak, your walking speed is 5 feet, and you have a flying speed of 30 feet. Your statistics, other than your size and speed, are unchanged. Anything you are wearing transforms with you, but nothing your carrying does. You revert back into  your true form after 2 hours, when you end the polymorph as a bonus action, or when you die.