Thresher Knight

Death has many who study or work with it. Some; Necromancers seeking power by raising armies of the dead, others searching desperately for a way to resurrect a fallen loved one, whilst some are doing the work of gods who need assistance laying souls to rest, others still believe immortality can be achieved through undeath. What ever your reason for studying death has been thus far you have not obtained the arcane knowledge or divine favor to accomplish your goal, however your search has had you prowling graveyards, haunted manors, abandoned churches and eerie laboratories and you have gained the attention and companionship of an Avatar of Death. The Avatar can fuse itself to you through Resonance, a synchronization of wills, granting you a aide in a number of ways.

The Avatar consumes the souls of the deceased near you, passing them on to whichever afterlife they are destined for. He is a shepherd of the dead and you are his farm hand, his trusted Thresher Knight. 

Your Avatar of Death manifests as a spectral wraith-like presence with large claws, It may or may not allow others to see him normally depending on the DM's discretion. He will however manifest visibly to targets of his attacks or abilities. If the DM so chooses he can become visible to everyone near you when it attacks or to anyone who makes a DC  perception or insight check on you. His coloration, garb and other physical appearances are yours to decide.

Grave Calling

At 3rd level Your Avatar acts as the bridge between you and the dead, at your request he will convene with the deceased and relay the information to you. You can cast the Speak with Dead spell as an action and the frightening appearance of death grants advantage on Charisma (Persuasion) checks when communing with the dead. You can do this a number of times equal to your proficiency bonus and regain all uses on a Short or Long Rest

Grim Benefactor

At 3rd level your Avatar is willing to help you in a variety of ways, Pick two from the Resonance list below, and each time you take a level in this class you can exchange one readied Resonance for a different one. At higher levels you and the Avatar are more strongly bonded and you will gain different boons from Resonance. Please see the Resonance table below. With each Resonance, the part of your body that is synchronized with the Avatar changes in appearance, this could be to match the Avatars current appearance, its appearance before it's demise or to match that of someone skilled in the task at hand, for example if your hands are in Resonance to help with picking a lock you may have longer dexterous fingers where as if you are using smith's tools you would have larger more calloused hands.

If a save must be made from the affect of a Resonance it is made with the DC 8+PROF+CON Mod.

Resonance

Reaper Level                                    Resonances available

          3                                                            2

          7                                                            3

        10                                                            4

        15                                                            5

Deaths Guiding Hand

-The Avatar Resonating within your hands guides you steadily, and seeming unerringly as you feel a calmness as if you have spent centuries handling the delicate souls of man. You have advantage on Dexterity ( Sleight of Hand) checks and adds 1\2 your proficiency rounded up to the use of any Tools.

--Additionally, when you hit a creature with an attack using a weapon, you can use this Resonance to have the Avatar haunt the target with a copy of itself: the target takes an extra 3d4 Necrotic damage as the haunting embodiment slashes at them relentlessly with its claws, The haunting embodiment lasts 1 minute has a range of 60 feet from you, and a movement of 25 feet on each of your turns, it only moves in the most direct path to the original target, and will pursue the target until time is up or the target is dead. It cannot be dispelled, and when the target moves within 5 feet of, or begins its turn within 5 feet of the haunting embodiment it takes 3d4 Necrotic damage. Once you use this Resonance this way, you can’t do so again until you finish a short or long rest

Death's Will

-The Avatar Resonates in your heart and throat giving you a sense that danger will only lead you to your friend, the Avatar, and allowing you to speak in the voice of a being who has killed entire civilizations. You have advantage on against being intimidated and Charisma (Intimidation) checks you make

--Additionally, when a creature who can hear you within 30 feet of you takes their action, after they decide what action it is, you can use your reaction to have them use the action they decided in a way that you choose (attacking a creature of your choice within their range including themselves, dashing the direction you want etc.) as the Avatar within your heart transfers your will directly into them. Once you use this Resonance this way, you can’t do so again until you finish a short or long rest.

Eyes of Death

-The Avatar resonates within your eyes giving you the ability to see in non-magical darkness and have a more keen intuition about mortals. You have advantage on Wisdom (Insight) checks and you have darkvision out to a range of 120 feet

--Additionally, when a creature you can see ends its turn within 30 feet of you, you can use your reaction to use this Resonance to force the target to make a Wisdom saving throw or be Frightened of you for one minute as the creature locks eyes with you for but a moment and sees one of its own possible deaths. Once you use this Resonance this way, you can’t do so again until you finish a short or long rest.

Grave Tidings (7th Level)

-The Avatar resonates within your mind, warning you of danger and guiding you towards a longer life. You gain advantage on Wisdom (Medicine) and (Survival) checks and you cannot be surprised so long as you are not incapacitated

--Additionally, With the Avatar's guidance from this Resonance you for 1 minute or until you’re incapacitated, when you or another creature you can see within 60 feet of you makes an attack roll, a saving throw, or an ability check, you can use your reaction to cause the roll to have advantage or disadvantage by playing with the threads of fate that tie us all to Death. Once you use this Resonance this way, you can’t do so again until you finish a short or long rest.

One with Death (7th Level)

-Your body resonates with the Avatar granting you the resilience of death it's self. You have advantage on death saves are resistant to Necrotic damage

--Additionally you can use this resonance to have the Avatar help cover your weaknesses in combat by emerging to deflect attacks from within your body, granting you +2 to your AC and casting Death Ward on you as an ability not as a spell. The AC bonus persists for one minute, Death Ward lasts one minute or until used.  Once you use this Resonance this way, you can’t do so again until you finish a short or long rest.

Death's Claw

Your Avatar manifests to assist you in your time of need. As a bonus action, you gain the following benefits, which last for 1 minute:

• You have advantage on STR checks and STR saving throws.
• Once on each of your turns, the avatar can make a claw attack as a weapon attack with which you are proficient for 1d4 damage to a target on a hit.

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses of it when you finish a long rest.

Deathly Refuge

Through your will the Avatar can alter the fates of your allies. When another creature you can see within 60 feet of you is hit by an attack roll, you can use your reaction to force the attacker to reroll the d20 and use the new roll.

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Delight in Death

Your avatar has begun to enjoy the thrill of combat and mortal dangers associated with it. When released It is more ferocious than before. 

The number of attacks from your Death's Claw feature increases by one

Deathst Friends

Your bond with your Avatar has become that of true partners or even friends, it is always by your side and plans to keep it that way even after your demise.

You can use each Resonance you have from your Grim Benefactor feature twice, rather than once, and you regain all expended uses when you finish a short or long rest.

Frenzied Harvest

The Avatar and you both may enjoy battle to much, the Avatar can now distance himself from you slightly and has again become more aggressive. As a result the number of attacks the Avatar makes with the Death's claw feature increases to 3, and his reach increases by 5 feet.