Master of Beastly Shapes

As a druid, attuned to animal and the most wild aspects of nature, you become a step above the common leaf-adorned glade guardian. You are able to tap into the most primal aspects of being, deep within your wild spirit, and use it to become the most ferocious beasts.

-You gain additional uses of your wildshape class ability equal to 1/2 your proficiency bonus (rounded down, minimum of 1).

-You gain the ability to transform into higher CR creatures. The number of which is equal to 1/2 your proficiency bonus (rounded down). To use this feature, you must expend 2 uses of wildshape to enter this increased form. If only 1 use of wildshape remains, you can instead expend 3 levels of spell slots (ie. a 2nd level spell slot and a single 1st level spell slot or a single 3rd level spell slot). Regardless of which form you take, your choice is still restrained by all other requirements set by the wildshape class feature (swim/climb speeds, beast only) and it also stays active for only half the time your druid would normally be able to stay in their chosen form, exiting early if the form is reduced to 0 hit points as normal.