Path of Dread

Barbarians who walk the Path of Dread draw their rage from their inner darkness. A vision of truth has sought them out, promising greater power and carnage to them in exchange for service. By walking the Path of Dread, the barbarian has made a deal with a dark patron and draws strength from the barren field of their forfeited soul. The chosen patron is at the discretion of the DM and player. 

Spellcasting

Spellcasting Barbarian

Pact of Strength

Your Patron has granted you a small test of their strength. Imbued with new power, your gain +2 to your Strength score permanently  (as long as you have this subclass). In addition, you gain a small fraction of their magical essence and are able to use cantrips and spells. Your STR is the modifier for these abilities. You are granted 2 level 1 spells from the Warlock and Paladin class at level three and you may pick additional spells at levels 5, 7, 9, 11, 13, 15, 17, 19, and 20. In addition, you gain four cantrips from these table as well, and may choose one additional cantrip at each level up. 

Pact of Carnage

Thanks to your patron, your power grows...as does your need for carnage. Your rage becomes hungrier and relentless, for a price. While raging, you may invoke your Patron's name to increase your melee attacks by an extra 1d10 slashing damage once per round. If invoked, at the end of combat, you gain a point of exhaustion. In addition, if you fall in combat while Relentless Raging, you rise from unconsciousness with 10 hp. You gain two points of exhaustion each time it happens. 

Pact of Onslaught

Your power grows as your Patron shapes you into an even greater weapon. Your visage changes, casting fear upon your enemies, and now are one size larger. You now can wear heavy armor at no cost and wield two handed weapons with one hand. You are granted knowledge and skill by a sinister force, making you proficient with shields and armor. You gain the following benefits:

Advantage on Intimidation checks
Proficiency in shields and heavy armor
You wield two handed weapons with one hand (you cannot dual wield two handed weapons)
You can wear heavy armor with no handicap, disadvantage, cost, etc. 

Pact of Servitude

Your service has been rewarded with even greater power. You are now an expert in Intimidation. You may also use the Unrelenting Rage modifier on every attack for the same cost. In addition, your armor drips with necrotic energy, causing 1d8 damage against any one each who hits you. You gain the following benefits:

Unrelenting Rage modifier (1d10) on each attack for the same cost (1 point of exhaustion, end of combat)
Expertise in Intimidation
Your armor deals 1d8 necrotic energy against any who strike you