Allows a Yuan-ti Pureblood to change their legs into a snake tail and back.

The transformation takes an action. While with the tail, the user is unaffected by Difficult Terrain, has advantage on grapples and disadvantage on Acrobatic checks. Starting an encounter with the tail active gives a +1 to Initiative. Can only be casted twice per Long Rest. The tail inflicts a -10ft to the user's walking speed.

The user's pants, belt, and shoes melds into the tail, dresses and skirts are unaffected. The user can't activate, wield, or otherwise benefit from any of its equipment.