Bone daddy

You were created in a lab and grown their since you were a child, having your creator done thousands of experiments on you over time have left you broken and fragile and even damaging your magic although this does not come without it's perks. You have more magical energy running through you and have special skill drilled into your very nature of your being, all of this at the cost of your own life body and soul. You become tired easy have a damaged body both weak and fragile almost like a glass canon. On your right hand in a metal hand plate drilled through the bone and tightly clapped on, you have had this since you were a child. Engraved on the metal plate is the phrase WDG - 1S. There has never been something like you and there will never be something like you again. 

Half life.

Your body Is weak and not well built forcing you to tire quickly. This restrain on you body causes you to gain a level of exhaustion for every 6 rounds in combat (You do not gain a round in combat if you have not moved, or taken any actions for the purposes of this affected). In addition when you gain a -2 to Constitution and a -1 to strength. When gaining health you can not lose and must gain a minimum health of 1 and for starting health points you may act if your con was 10.

Hard to hit.

Beginning at 6th level, when you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail. In addition you gain advantage on the saving throw, and a bonus to AC that equals your proficiency. 

Relentless assault

At level 6 you gain the ability to use your reaction via spending a sorcery point to cast a spell.

DR WD Gaster Blaster

You summon a medium construct that resembles a wolf skull in it's base form, this construct acts as your familiar you can see. hear, taste, and even smell through it although it can not be more than 100ft away from you and if so it despawns. It act more like a well trained dog than any anything else obedient to you but not under your control you can use a free action to get rid of them and a reaction to spawn then in, the max number you can have at one time is equal to your sorcerer level and you can use your bonus action to make them fire off a beam of magical energy. When normally summoned Ghaster Baster count as being level 1, level 2 requires 5 merged together level 3 requires 10 and level 3 requires 15. Ghaster Blaster can only be cast through these creatures and must be cast at the appropriate level. A level 1 Ghaster Blaster is the only level that can cast Ghaster Blast at levels cantrip - 3. A level 2 Ghaster Blaster is the only level that can cast Ghaster Blast at levels 4 - 6 and A level 3 Ghaster Blaster is the only level that can cast Ghaster Blast at levels 7 - 9. Gaster Blaster can fire off a bean equal to their size lvl1 - medium, lvl2 - large, lvl3 - huge and the higher the lvl the more scary and evil they look. lvl1 - wolf skull, lvl2 - T-rex skull and lvl3 - Dragon skull.

Dimension glimpse

Your skeleton ancestry lets you glimpse into the future and into the past for a brief few seconds, you might see anywhere from a couple or millisecond into the future/past to a couple of decades into the future/past. This could be anywhere from random bits of information that serves no use what so ever to dire secrets that could destroy the very fabric of reality (something completely random linked to what the character might face, become, do and so on.)

Outside of combat: Every now and then the DM may ask the player to roll a d100 to get a glimpse into the future/past. The higher the roll the higher the chance of something great or important being seen. Depending on the roll the DM will chose what will be seen and how important it is.

Inside of combat: Once per long rest when ever your life is in danger from an attack, harmful spell or affect you can chose to foresee it and avoid it. This could be in the form of seeing a trap you active that would kill you and stopping at the last second or getting a sudden urge to instead avoid it. This could be in the form or avoiding an attack that will kill you and causing it to instead miss. It could also be in the form of redoing decisions that would other wise kill you (how this works is in the form of an attack the player can chose for it to miss, in the form of a harmful affect the player can chose that he sew this coming and instead redoes something in the past or the DM warning the player, and for a spell causing it to miss or not target him at all or even the player doing something to avoid it or the DM warning the player.