+1 AC. You cannot feel pain. You have resistance to poisons. You have no need to sleep, eat, or breathe. 

Most people will attack you on sight (DC 15 wis check), mistaking you for a normal, unfeeling undead. You can circumvent this through wearing heavy armor. 

You are weak to holy spells. You have -2 to all stat checks whole on hallowed ground. Instead of healing through spells or long rests, you must cannibalize humanoid corpses for spare parts in order to heal