Bone Knight

Bone knights were the paladins of Thanatos the god of the undead. After they perished they got to choose whether they wanted to protect hell or return to serve another master. Most chose to stay down in hell but those who didn't came back and are now roaming the world looking for another master to serve and protect.

Channel Divinity

When you take this oath at 3rd level, you gain the following two Channel Divinity options:

COMMANDER PRIVILIGE
you gain the aid of an undead warhorse skeleton to ride into battle. If your mount dies, you can spend 1 hour to reanimate each corpse, which you can do over the course of a short rest. It takes a 10 minute ritual to summon it. requires concentration 

COMMANDERS PRESENCE PRESENCE 
You can use your action try to take control of a number of undead creatures within line of sight equal to your charisma modifier and the target must make a wisdom saving throw DC= {{8+proficiency+modifier:str}}. The target has Advantage on the save if you or your allies are fighting it. The control lasts for 5 rounds. 

Oath Spells

You gain oath spells at the paladin levels listed in the Bone Knight Spells table.

Paladin Level	Spells
3rd	Cause Fear, Wrathful Smite
5th	Wither and Bloom, Ray of Enfeeblement
9th	Speak with Dead , Animate Dead
13th	Spirit of Death, Blight
17th	Danse Macabre, Reincarnate

Dulan's trick

you can safely dismember your head and use magic to move it around freely. it can move 15 feet away from your body in any way you want. however you can only voluntarily remove your head safely, and you skull can still be hurt once removed.

Evolved skeleton

you gain a +2 to your AC as long as you are not wearing armor or wielding a shield 

Undead guard

You can summon a skeleton protector that accompanies you on your conquest. It acts on your initiative and obeys your commands in battle.

Add your proficiency bonus to its attack rolls and damage rolls, as well as any saving throws it is proficient in, and it gains hit points equal to your paladin level + con modifier.

At 10th level, your skeleton protector becomes a dread warrior.

Bonified weapon

You use magic to transform one of your ribs into a simple dagger, this dagger counts as a magical weapon. You can use this as long as you have ribs left to transform, you can return the weapon to it's original position as a rib with a bonus action.

see  Dagger, +2 for weapon stats

Bone shield

You get to cast the spell [Tooltip Not Found] for free once per long rest, if you are already wielding a shield your bones will cover this shield instead. The shield will last for 1 hour. You also gain proficiency with shields if you did not already have it. 

Aura of death

You gain access to the Circle of Death spell. You can cast this spell three times every long rest. This spell will damage all enemies and leave any and all friendly creatures unharmed.