PETA (yes, that PETA) has released a new 5E supplement containing three new subclasses that embody the organization's stance towards animals. Today, PETA released a new free-to-use supplement containing 5E compatible subclasses for the Paladin, Ranger, and Druid. The new subclasses include the Oath of Animal Liberation Paladin, the Warden of the Wild Ranger and the Circle of Empathy Druid. Obviously, with this being PETA, the subclasses focus on the ethical treatment of animals (including not using animals as a source of food or labor), and general attempts to empathize with other living beings.
PETA has often mocked, spoofed, or criticized games that don't adhere to their ethical standards, often in grotesque and graphic ways. However, this D&D subclass supplement is actually very uplifting by comparison and generally follows 5E (2014) power scaling.
There's also two new spells, one of which opens any cages or bindings on animals, and the other of which gives a literal crimson mark to those "who hunt or otherwise harm animals."
You can check out the new subclasses over on PETA's website.