The Wildshaper (2019)

From publisher blurb:

Full attack bonus progression? Shape shift at first level? You've come to the right place.

Some individuals develop a special connection to nature and become rangers, druids, or hunters. Members of these classes learn many of nature’s secrets: movement and survival in natural terrain, the strengths and weaknesses of various kinds of creatures, communication and friendship with animals, and even the mysteries of natural magic. Many, if not most, of these individuals come from cultures that are less urban and more in tune with nature. Yet anyone, even a lifelong urbanite, can learn the ways of nature with enough practice.

There are others, however, who from birth possess a connection to nature more fundamental than that of the greatest druid or ranger. Although they may never master druidic spells, they are born with one of the most ancient, and most primal, manifestations of natural magic: the ability to transform their own bodies into the forms of animals.