Hybrids

Hybrids are a tricky species, as they technically shouldn't exist. It is the unification of two beings who are of different species who have a child, which results in them being an incredibly unique mixture of both beings. Multiple hybrids can be the same (such as a wisp x hare), but their abilities, looks, and attributes can be wildly different.

Interesting things about hybrids is that no one can be absolutely certain of their gestation period, their abilities, and lifespan. Some researchers believe that while wildly different, hybrids could be classified as their own species based on these simple facts alone bringing them together.

The main thing that 'makes' a hybrid is the inability to learn magic. Creatures have been trying for centuries to figure out why to no avail.