When Contessa was still human, she was of the custodi on Fiora.
But shortly after her spark ignited, she was diagnosed with an incurable disease which put her in a deep depression. The Multiverse had just been opened to her and yet she was bound to die long before her time. What she did was study in the darkest and deepest arts of magic on Fiora, Zendikar and Amonkhet.
Eventually she found a way to bind her soul onto any sort of mineral, be it gold to sand. That was many years ago, and today she is nothing more than conscious traveling through the multiverse, rather than keeping a physical form. The moment she binds her soul onto a plane, she immediately start to assemble a body of nearby material.
She is unable to create legs or anything that resembles anything but an upper body, vastly incapacitates her stride. She is however able to travel by reassembling herself, and her range to which she holds influence over is 10 km. The process of turning herself into this form has left her mute, but she is currently working as a body guard for a very…influential person.
Because of the effect of her binding her soul onto minerals, it left her unable to talk. On top of that, she was based on the ability Morph, meaning no matter what, her form is always different whenever she assembles herself.
Due to not having a body, she is immune to any sort of physical or magical attack, and her body is constantly reinforcing itself.