Path of the Ice Scythe

The rage of a barbarian comes from many places. For those who walk the path of lament, that rage is grief. Bestowed with supernatural powers by the goddess Akka, these warriors rip souls from bodies like grief has ripped joy from their hearts.

Winter's Bone

When you activate your Rage or as a Bonus Action while your Rage is active, you can let out a scream that sends the wrathful cold of winter down the spines of your enemies. Each creature of your choice in a 30-foot Sphere originating from you makes a Constitution saving throw (DC 8 plus your Constitution modifier and Proficiency Bonus). On a failed save, a creature takes Psychic damage of a number of d12s equal to your Rage Damage bonus and has the Deafened condition for 1 minute. On a successful save, a creature takes half damage.
You can use this feature a number of times equal to your Constitution modifier+proficiency bonus (minimum of once).
You regain all expended uses when you finish a Long Rest. You can also regain all expended uses by sacrificing one hit die (no action required).

Commune With The Dead

Akka has granted you the ability to converse with the dead as she does. Once per day, you may cast Speak with Dead as a ritual. 

Chill of the Grave

Once per turn when you hit a creature with a Strength-based attack roll while your Rage is active, you can attempt to horrify the target. The target must succeed on a Wisdom saving throw (DC 8 plus your Constitution modifier and Proficiency Bonus) or have the Frightened condition until the start of your next turn.

Agony of the Soul

You draw power from a sorrow so deep it extends beyond the boundaries of the realm of the living. You gain the following benefits.
Deathly Wail. If a target fails its saving throw against your Winter's Bone and it has Hit Points equal to twice your Barbarian level or fewer, it drops to 0 Hit Points instead of taking damage.
Impenetrable Sorrow. You can’t be possessed.
Resistance. You have Resistance to Cold and Necrotic damage while your Rage is active.

Death Becomes You

When you activate your Rage, you can use your connection with those who have passed beyond to empower yourself. You gain the benefits below for 1 minute or until you drop to 0 Hit Points. Once you use this feature, you can’t do so again until you finish a Long Rest.
Immunities. You have Immunity to the Charmed and Frightened conditions. If you’re Charmed or Frightened when you empower yourself, the condition ends on you. In addition, you can’t gain Exhaustion levels.
Life-Draining Strike. When a creature fails its saving throw against your Chill of the Grave, the creature takes 2d10 Necrotic damage. You regain Hit Points equal to the Necrotic damage dealt.
Bitten by the Jaws of Life. You become immune to Cold and Necrotic damage while raging.

Hit Points

Hit Dice: 1d12 per barbarian level
Hit Points at 1st Level: 12 + your Constitution modifier
Hit Points at Higher Levels: 1d12 (or 7) + your Constitution modifier per barbarian level after 1st