From publisher blurb:
Wielding a weapon bathed in their own blood and harnessing magics of otherworldly beings are those fighters who follow the path of the Witch Knight. They are Pact Magic three-quarter-casters who can use their limited supply of magical energy to cast eldritch spells, inspire fear in their enemies, or invoke one of thirteen horrid blood curses upon their targets. One would be wise not to cross any belonging to this sinister and potentially villainous Martial Archetype, lest they meet a swift and painful end.
In addition to their own magics and abilities, new magical skills, items, and powers to be used by any character can be found alongside this archetype. Within this document, you can find the following:
The Witch Knight subclass for fighter, as well as multiclassing information for Pact Magic classes.
Three new Fighting Styles for fighters, rangers, and paladins.
Four combat-focused Eldritch Invocations.
Eight spells intended for warlocks from 0th to 4th level.
Eight combat-oriented magic items, including the infamous legendary dagger, Bloodrender.