Scions of Dusk

From publisher blurb:

With an emphasis on darkness and the planes of shadow, Scions of Dusk is a compendium of options for players and DMs, compatible with the 5th edition of Dungeons & Dragons.

Inside you will find:

Changeling, the offspring of dark fey raised by humans.
Shadowborn, descendants of humans with a shard of shadow essence in their soul.
Oath of Sin, a new oath for paladins who become heralds of vices and passions.
The Vampire, a new and bloodthirsty patron for the warlock class, complete with two eldritch invocations for vampiric warlocks.
Dark Ones, devious dwellers of shadow.
Three new magic items.