Mark of the Fiend

You have been marked by a denizen of the lower planes. A large tattoo representing the entity that has marked you appears on either your back or thigh. As a result, you gain the following:

• Increase your Charisma score by 1, to a maximum of 20. 
• You gain the ability to cast the control flames cantrip.
• A familiar manifests itself at the end of your next long rest. This will be a Quasit or an Imp, depending upon the nature of the fiend that marked you. This creature functions as a familiar in all respects, though it can only take forms dictated by its shape change ability.  In addition, the character can surrender one of their attacks to have the familiar attack as its reaction.
• You learn the find familiar spell, and can cast it as a ritual. 

If the familiar dies, you may resummon it via the ritual, however, the familiar will reappear at the end of your next long rest, whether or not you wish it too. Additionally, the mark whispers to you, though you may or may not understand it.