From publisher blurb:
In this release, we've got some fun options for those who looked excitedly at the new Cultist background in the Level Up core rules with everything you need to make a cleric/warlock.
The new cleric archetype is the Execrator, a master of divine wrath who metes out punishment with curses and debuffs, making an example out of their foes.
Warlocks gain access to the new Vestigialist archetype which channels the essence of fallen divinity, becoming an expert in forbidden knowledge, making their minds dangerous to contact, and eventually even taking on the aspects of their fallen patrons.
And the new Heterodox Devotee synergy feat chain allows you to combine these two archetypes or any other combination of cleric and warlock into a unified new whole.