This cleric subclass was inspired by the idea of haveing a darker cleric that wasn't tied to undead.
Are you tierd of playing goody two shoes clerics sworn to some high and mighty god. Then why not try evil? Swear your allegiance to dark devil or firey fiend. Shun the light of the world and make people fear the dark. Remeber the light at end of the tunnel is just the flames of hell.
Mechanically you gain access to new cantrips and proficiencies at fisrt level that make you better able to fight on the front lines and deal with people in less violent ways.
At later levels you can offer up your suffering and hit points to provide resistance for you and your allies. Your final ability allows you to harvest the souls of your slain foes to replenish yourself.
- from the publisher's blurb