Path of the Umbral Vanguard

From spending months or years in the Shadowfell, or from years of practice, those that survive might become Umbral Vanguard. An incredibly rare and deadly barbarian, using their rage to form twisting shadows to defeat foes. Simply being in their presence can drain a persons emotional and physical spirit. 

Umbral Rage

When you go into a rage, each creature within 5ft of you must make a Charisma Saving throw against your DC (8 + Proficiency Bonus + Constitution), each creature that fails this save takes 1d6 necrotic damage, and your rage damage increases by 1 point for each creature affected by this effect. This effect lasts until your rage finishes. This damage increases when you reach certain levels 2 at 5th Level, 3 at 10th level, 4 at 15th level, and 5 at 20th level.

Unbound Shade

When you reach 6th level, when you rage your shadow becomes a weapon in itself. You can use your bonus action to control this weapon, it can attack any creature within 10ft of you. Its attack modifier is equal to your proficiency bonus + your Constitution modifer. This weapon deals 2d6 necrotic damage + your rage damage bonus. 

Master of Shadows

At 10th level, each time you rage, you become cloaked in shadow. Ranged attacks against you have disadvantage, and any creature within 5ft of you has disadvantage to hit targets that aren't you.

Touch Undeath

At 14th level, the power of the Shadowfell runs within your veins, keeping you alive. If you hit 0hp whilst raging, you do not fall unconscious. You continue to roll death saves, and if you fail 3 death saves, you do not die until you are no longer raging.