You have a base AC of 16 (,you do not gain a bonus from your Dexterity modifier,) but you cannot wear armor unless you retract your bone protrusions (losing your 16 bonus AC), or ask for your armor to be made to accommodate the extra skin. 

Starting at the 1st level you have 2 bones, as a bonus action you can shoot 2 bone shards dealing 1d4 damage each, with a range of 20 ft. and a max range of 40 ft. You gain 1 for every level and 2 for every 5th level. You can use a bonus action to shoot 2 bone shards dealing 

Your Strength score increases by 2, and your Constitution score increases by 1.

Since they have already died, it is not known whether or not Deserter Demons have a limited age until death.

Since the Deserter Demon has already died they are stuck in the mortal plane when they die; the only way to revive them is with a Resurrection, True Resurrection, or Wish spell.

Deserter Demons vary from all sizes, but most are seen as 6'5" and above. Your size is medium.

Your base walking speed is 30 ft. when you retract your armor you have a walking speed of 35 ft. and when you reach level 10 you sprout leathery wings giving you a 5 ft. movement speed for a total of 40 ft. of movement speed without bone armor.

The overgrowth of your bones has lead to the ability to use your claws as slashing weapons. They deal 1d4 damage.

Your infernal nature gives you the natural ability to, speak, read, and write Infernal. You also have the ability to speak, read, write, Common and one other language of your choice.