Circle of Lycanthropy (Polar Bear)

Read above. As above, so Below.

Level 2: Hybrid Form

Starting at 2nd level, you can expend a use of your wild shape as a bonus action to augment your body with animalistic features. When you transform in this way, you gain a number of temporary hit points equal to the beast's hit points up to a max of twice your Druid level. You have chosen a Polar bear. While transformed, you gain all of the beast's travel speeds, skills, senses, and basic natural weapon attacks (you cannot use multiattack or any other special attack action that the beast may have). The transformation lasts 1 hour, though it ends early if you fall unconscious, change forms in any way, or transform back to normal as a bonus action. Also, if you are hit by a silvered weapon, you must make a spell concentration check to maintain your form.

While in Hybrid form, you also get a bonus to your armor class at the following levels.

Level 2	+1
Level 7	+2
Level 12	+3
Level 17	+4
Level 20	+5

Lycanthropic Defense

As you learn to control your Bestial form, you begin to take on some physical traits of your chosen Animal; Maybe tufts of white hair, a slight growth in height, or another innocuous physical difference. However, your skin has grown thicker.

Unarmored Defense

At 2nd level, as long as you are not wearing armor, your armor class is equal to 10 + your dexterity modifier + your wisdom modifier.

Level 3: Hybrid Casting

Starting at 3rd level, you may cast spells while you are in hybrid form. While in hybrid form, you may cast a number of spells equal to half of your druid level, rounded down. 

While in Hybrid form, you cannot cast spells that require concentration. If you are concentrating on a spell when you enter Hybrid form, you must succeed on a Constitution saving throw equal to 12+the spell’s level. On a failed save, the spell ends. On a successful save, you maintain concentration on the spell but must re-roll the saving throw at the beginning of each of your turns, adding 1 to the DC each time you succeed.

Bestial Soul

Your Beast-blood grows more powerful. You take on another aspect of your beast and become even more like them.

At 6th level, while transformed into your Hybrid Form, you also gain the passive abilities of the beast you take the form of.

Your natural weapon attacks are also considered magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Level 10: Werecasting

Once you reach 10th level, you are able to weave spells and bestial strikes together. After casting a spell, if you are in Hybrid form, you can add your Wisdom modifier to your next attack and damage rolls made before the end of your next round. After hitting a creature with a natural weapon attack, you can either gain advantage on your next spell attack made against them or impose disadvantage on the saving throw for your next spell.

True Beast-Blood

At 14th level, you can now utilize a beast's full potential in your Hybrid Form. You now have access to a beasts multiattack and any other special attack actions while in hybrid form. If a beast's abilities include a DC to overcome an extra effect, you can use your spell DC in its place.

Additionally, when you transform you can choose one of the beasts physical attribute scores (strength, dexterity, or constitution) to gain for the duration of the form (maximum score of 20).