Through rigorous training you have managed to gain access to new animal abilities. You gain the strengths of the Berg-Bear, the Cryo Scorpion, and the Horn Hound. You can use one these beasts' strength to your advantage. You can use this a number of times equal to your proficiency bonus and it resets on a long rest.

Berg-Bear: As a reaction you can take the strength and weight of the mighty Berg-Bear. If you are hit with a weapon attack, you can add your CON modifier to your AC. If you are forcefully moved by means of a shove or spell, excluding teleportation and enemies that can clearly move you with ease (some huge enemies and gargantuan), you can resist the forced movement and even shove the attacker if they are within 5ft of you.

Cryo Scorpion: As a bonus action you sprout a tail with a reach of 10ft, mandibles, and razor sharp pincers. These will use your Form of the Beast attacks for your rolls and count as magical attacks. Your tail attack will cause cold and piercing damage. Your claws give you advantage on grapples. Your bite attack will cause piercing and can inflict poison. The target must make a save equal to 10 + your  STR modifier. This lasts for 10 minutes, if you are unconscious, or cancel it yourself.

Horn Hound: As an action you can strike your target with the deadly horn that emerges from any place on your body. You make a melee weapon attack using your Form of the Beast dice. If you hit, the target is pierced and is considered grappled by you. You can break the horn off if you choose (this does not use any action). You can also charge your target. If you hit while charging, the target will get carried the same amount of feet that you moved during your charge. If they hit a solid surface before or at the end of the charge, you can break the horn off and they will be pinned to the wall until their next turn.