Circle of the Beasts

Transform into Beasts instead of using spells. 

Wild Shape Superiority

When you choose this circle at 2nd level, you forgo all use of spells but you maintain your spell slots. In addition to this, you now use your spell slots to Wild Shape and you do so as a Bonus Action.

When you exit a Wild Shape by this way, either from reaching zero hit points in Wild Shape or voluntary, you suffer damage equal to 10% times number of Spell Slots used. 
For example, a second level Druid with 20HP and three 1st level spell slots can Wild Shape into a CR1 beast three times, taking 2 damage each time or they could Wild Shape into a CR3 beast once, taking 6 damage when they exit. 

Cantrip transformations are CR less than 1 and you lose no Hit Points on exiting these beast forms. 

 

Circle Forms

The ways of your circle forbid the use of spells instead focusing on communing beasts and grants you the ability to transform into more dangerous animal forms.

Starting at 2nd level, you gain proficiency in Animal Handling if you do not already have it and you can use your Spell Slots to transform into a beast with a challenge rating equal to number of spell slots used (you ignore the Max. CR column of the Beast Shapes table, but must abide by the other limitations there).

You can transform into challenge ratings less than 1 at will, as though using a cantrip. 

The use of spell slots to Wild Shape overrides any other uses of Wild Shape from the base Druid source.  

Primal Strike

Starting at 6th level, your attacks in beast form count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Beast in Sheep’s Clothing

Proficiency bonus times per day you can “Wild Shape” into a humanoid shape, as though using the spell Disguise Self.

Beastial Refuel

Was an action you can regain a number of spell slots equal to your Wisdom modifier. Once you use this feature can’t do so again until you have a Long Rest.
You are considered to always be under the influence of Speak with Animals.

Circle Form Improvement

At 6th Level you no longer need to use a spell slot to Wild Shape into a beast with a challenge rating of less than 2. 

Wild Shape Overdrive

At 10th level, once per day you can surpass the CR10 limit of Wild Shapes. After you use this you can’t do so again until you complete a Long Rest.
When using this feature you also gain access to the “Elemental” creature type to Wild Shape into. 

Circle Form Improvement

At 10th Level you no longer need to use a spell slot to Wild Shape into a beast with a challenge rating of less than 3.

Shapes for All

By 14th level, you have learned to alter other creatures bodies as well as your own. You can cast the animal shapes spell once per day. For you this is not considered a spell. 

Circle Form Improvement

At 14th Level you no longer need to use a spell slot to Wild Shape into a beast with a challenge rating of less than 4.