mystic mutation sorcerers are outcasts in many areas they’re very existence being considered unnatural an affront to the natural way of the world. 
in other areas they are revered considered to be blessed by magic itself.

Reactive skin

You have learned to control your body’s reaction to magic. Granting you the ability to adjust the makeup of your skin to be resistant to perceived danger.
Choose a damage type you have resistance to that damage if you are wearing no armor. When you are about to take damage you can can change your resistance to match the damage type for 1 Sorcery point.

Living weapon

You can use the magic entwined with your body to create a new appendage or lengthen, twist, and shift existing ones.

As a bonus action choose piercing, bludgeoning, or slashing and create a 1d10 natural weapon of that type or change your existing living weapon to that type.

 At level 6 your living weapon is considered magical and you can choose from the damage types: acid, cold, fire, lightning, necrotic, radiant, or thunder.

Surging strikes

As you begin to more innately understand the weave around you you develop an increase in control over the fluctuations in your body. Allowing you to significantly increase the speed your appendages can move.

You can spend 2 sorcery points to gain an extra attack with your Living Weapon as part of an attack action. You can you this feature a number of times equal to you CHA modifier per round.

Mystic blood

Your understanding of the weave and how it communicates with your body has become so naturally you no longer have to think about spells that are affecting you.

You can not lose concentration due to damage on spells that effect you or your living weapon. If a spell has multiple targets you must still make a concentration check if it fails the spell ends for all targets except yourself and/or your living weapon.

One with the weave

Your body is truly part of the magic of the world. Magic sometimes passes through you leaving no effect.

You gain advantage of saving throwing against all spells and spell like abilities.

when a creature targets you with a spell or spell like ability it does so with disadvantage.