At this moment, this is my favourite resource for warlocks. The patrons are well-balanced, thematically appropriate and unsettling in a Lovecraftian style that'll leave the other players at the table saying "You made a pact with a what?..." The extra invocations and pact types are a great addition too. Even down to the little touches such as each power's name, this a brilliantly constructed piece of work. The cherry on top is the unique art. My favourite patron (today): The Deep One - a clever way of making an underwater patron still relevant on land.

It was lovely to see spells from previous editions make their way into this book - all translated expertly to fit the streamlined 5th edition. It was also great fun finding new an interesting ways to surprise players/your GM. While not official, my opinion is that these spells have been well balanced and have the potential to add some interesting flavour to most classes. In fact, my biggest concern with this book is that if my GM allows it, I'll be struck with decision-paralysis.