From publisher blurb:
Do you want to play a Warlock in your next 5e game but aren't interested in the run-of-the-mill Patrons from the handbook? Or, maybe you ARE interested, but just not in the generic "Fiend" or "Great Old One" because you need specifics. Maybe you want something unique and provocative but don't have the time to create one; besides, then you would have to crunch the numbers to make sure it fits in line with the published content, so your GM doesn't have one of their "you-broke-the-game" meltdowns. Look no further. The Chanting Druid has what you are looking for. Each release from this line will have a new (and more importantly: unique) patron to drop into your game, complete with rules and information for the GM and player through all levels. There are even a few story hooks that can lead off to an adventure all its own.