Your Constitution score increases by +2 and one other ability score of your choice increases by +2.

 Zombies do not 'age', however their bodies may begin to decay beyond use towards the end of their former race's lifespan.

Zombies act as a blank slate, lacking their memories they tend towards the any alignment their previous race might have tended to, or otherwise the circumstances around their resurrection might seriously impact their alignment as they make new decisions on the world. A particularly strong willed individual might retain some elements of their old alignment, but they might form a new perspective such a chaotic good character who stole from the rich to help the poor now doing it instead only to hurt the rich.

Your size is of your original race, it should be either small or medium.

Your base walking speed is 30 feet.

As a zombie, you must have died for some reason. Frightening scars or the stench of death grants you proficiency in the intimidation skill, if you already had proficiency, you may double your proficiency bonus for intimidation.

You do not need to rest your body the same was as the living. Though you still need to eat, you only need to rest for 4 hours to gain the benefits of a long rest, rather than the full 8. 

When you take damage that would drop you to 0hp, you can make a constitution saving throw with a dc of 5 + the damage over 1 taken, unless the damage is radiant. On success you withstand on 1hp instead. You can use this feature twice between long rests.

Your deathless nature defies the laws of the living, as such detaching you from the gods that govern them. Though it might not have been your choice, you are forced to shy from the light. You have vulnerability to radiant damage and cannot be targeted by cleric or paladin spells, such as cure wounds or shield of faith. If you are somehow affected, you gain no benefit, with the exception of death domain or oath breaker paladins. Additionally you count as both humanoid and undead. For the purpose of channel divinities, consider your challenge rating equal to your level.

You gain resistance to necrotic and poison damage, and you have immunity to the poisoned condition and non magical diseases. Additionally you count as one size larger when determining your carrying capacity.

You can speak, read and write two languages of your choice. These should be languages you would have known in your past life