"One second he was there, the next, a wall of black. I never set foot in that cathedral again." -Olliber Sappinroot.
You have the power to turn into a living shadow. Your move speed is increased by 25 ft. In combat, while in Shadow Form, your hp is reduced by half your hit point maximum, but your AC is raised by your Proficiency Bonus + Charisma Modifier + Dexterity Modifier. You may not attack as a shadow. Out of combat, you may use Shadow Form as a method of Stealth. On Stealth checks roll with advantage.