Path of the Dark Knight (100 words challenge)

These Barbarians act as beacons to cull the corruption of the world. Dark Knights live by their own code, subjecting their hearts to the darkness and evils of the world so that others can stay pure.

Darkside

When you enter rage, you also enter Darkside.

• Your rage deals necrotic and heals an equal amount.
• Creatures affected by this damage can’t regain hit points until the end of their next turn.
• You can't be charmed.

Dark Emissary

You see normally in nonmagical and magical darkness up to 120ft

The Blackest Night

Once per short rest, as a reaction, when an ally within 30ft takes damage. You shield them, negating damage equal to your level

Flood of Darkness

Twice per day, when connecting with a weapon attack. Deal 4d8 necrotic damage and create a 20ft. radius sphere of darkness on target location that lasts 1 minute.