Implacable

Ability Score Increase: You gain +1 to your constitution score, to a maximum of 20.

Relentless toughness: 

• When you are reduced to 0 Hit Points but not killed outright, you can drop to 1 Hit Point instead. Once you use this trait, you can’t do so again until you finish a Long Rest.
• Immediately after you use your Relentless Endurance trait, you can use your reaction to make one weapon attack.
• You gain +1 to your Armor Class.

The strength of the mountain and the fury of a mother grizzly—unyielding, unstoppable, and damn near unkillable.
His enemies say he can take a dozen arrows and keep walking. His allies say he’s the last thing standing when the dust settles.

Boar wrestler: 

• You gain advantage on Animal Handling checks.  In addition, you can add your proficiency bonus to the roll if the animal is a horned/tusked  quadrupedal.
• You can grapple a horned/tusked quadrupedal beast creature that is 2 sizes larger than you.
• Whenever a horned/tusked quadrupedal beast creature uses 10ft or more movement and uses an Attack Action against you, you can use your Reaction to attempt to grapple the creature.  If the creature fails this saving throw, you deny it's attack, it has the grappled condition, and have disadvantage when attempting to escape it.