Vampiric Exultation

Prerequisite: Vampire, Ixalan setting

As an action, you transform the lower half of your body into a black vapor. You can float in the air and have a flying speed of 30 feet. This effect lasts for up to 10 minutes. Once you use this ability, you can't use it again until you finish a short or long rest.

Source: Plane Shift Ixalan