Path of the Silver Door

The Path of the Silver Door barbarians have been infused with a sliver of the Silver Key, or otherwise subjected to energies from beyond the door. This has tied their very soul to the unknowable aberrations from beyond the stars. Additional powers can be gained by seeking out more slivers and added them to your own, beyond what is listed here.

Mind Warping Anger

While raging you emit a 10 foot aura of Lovecraftian horror. Enemies in the aura subtract 1d4 from all d20 rolls they make. If a creature rolls a 20 on a d20, they ignore this feature for that roll. If they roll a 1 on a d20 then you gain a 1d4 inspiration dice. When a creature in the aura dies you manage to absorb a piece of their soul, healing you for an amount equal to your constitution modifier. 

Eldritch Horror Manifest

At 6th level you gain immunity to Psychic damage and the first time you hit a creature with a weapon attack each turn it makes a wisdom saving throw the DC is 10+ proficiency bonus + strength and if they fail are afraid of you. They may repeat the save each round at the end of their turn.

Silver of Blood

At 10th level enemies in your aura reduce their rolls by a 1d8 instead of 1d4. In addition your melee attacks against enemies who are afraid heal you for half the damage you deal to them.

Hurl beyond the Door

Once you hit 14th level you gain the ability to project creatures temporarily behind the Silver Door and into the great expanse of madness beyond. You learn the Banishment spell which scales with your strength and can be cast a number of times equal to your Constitution modifier. Creatures banished by this spell instead end up behind the Silver Door and are subjected to 10d6 psychic damage at the start of their turn. This damage ignores immunities and resistances.