Your intelligence and wisdom are both increased by 2

Already being dead and all, you are not able to age.

Your base walking speed is 30 

Being an undead thirsty for power just as you was in life, you will use all those around you to get what you want and to increase your power. If this means killing one that gets in your way? You do it. Saving somebody to gain their trust? You do it. Due to this, you should opt for a more chaotic-evil approach or chaotic-neautral

Simply being the skeleton of a human, you are as tall as you was in life. Seeing as humans vary widely in size, that can either be 5 foot or 6 foot, some may be taller than this, others smaller. Though, no matter what your size is, you will be classed in the "medium" section

Being a skeleton held together by nothing but the magic that flows through you, you are rather difficult to put down forever. When you "die" you simply crumble into a pile of bones, putting yourself back together again is childs play. You roll advantage on all death saves. 

You are undead, due to such, your eyes are great at seeing through darkness. You can see in complete darkness as if it was bright light (120 feet). You can also see through magical darkness, though you have to do a perception roll in order to see how far you can see (the required roll is up to the DM)

You have defied god and death, you brought yourself back from death and adopted the body of the undead and became a horrible, inhuman lich. Due to this, god has foresaken you.

If a holy object (cross, holy water, blessed items, etc) are in the immediate area, you roll disadvantage on all rolls whilst the holy object is near.

You are also weak to radiant damage.

You are proficiant in wisdom and intelligence saving throws.

Your bones are filled with a magical force, reinforcing them to be much stronger than that of a normal humans. This makes your natural AC 12.

Being a skeleton and all, you are completely resistant to diseases and poisons that don't come from a magical source.

Your fellow undead sense your power, they fear it and worship it in equal messure. As you have mastered necromancy to such a degree, you are able to command your fellow undead to fight by your side, or order them to stop attacking. You unlock this ability at level 5 and can only command undead at 4 health or below. (You can command up to 3 undead at a time)

At level 5, you get +1 spell slot which can only be filled with a necromancy type spell. You will get +1 spell slot for necromancy, you will get your next at level 10 and then level 20. (These will be seperate from your normal spell slots, meaning that you can also have your regular amount of them, plus these slots). (This trait may be removed later if it turns out to be too overpowered after i ask somebody with more experience in the game, or altered)

You get this at level 20, you may break out into dance at any time and cause the skin to strip from your enemy and they then begin to dance and die of exhaustion
(This is a joke trait if that needed to be explained)

I've ran out of ideas for this race, if I think of any more I will update the race, for now, I hope you enjoy. I'm still a noob to d&d, so forgive me if this is either to strong or to weak for a race and if some things are wrong.