Warden

Warden
Does the mountain yield? Can you hold back the tide? The forces of nature have always inspired disciples of the martial arts, and the art of wielding the primordial strength of the land is so ancient that its progenitors have long since faded to the mists of time. Even so, these so-called Wardens wield a strength none have been able to duplicate, and their timeless tenacity will likely see their techniques being used long after the most popular styles of the modern world have been forgotten.

Guardian Might
The power of a warden lies in the earth beneath their feet. So long as they remain in touch with the elements, no force can resist their demands. Beginning at 8th level, whenever you hit an enemy with a melee weapon attack, that enemy's speed is reduced by 10' until the end of your next turn. This effect stacks if you strike the same creature more than once before the duration ends. Additionally, whenever you use your Second Wind class feature, you gain resistance to all damage until the end of your next turn. Lastly, you can use your Constitution modifier in place of your Dexterity modifier to determine AC using Light or Medium armor.

Font of Life
As the seasons turn and the oceans rise and fall, a warden may shed ephemeral ailments with nary a thought. Flush with primordial life, their essence can recover from nearly any affliction. Beginning at 13th level, you may choose to make a single saving throw at the start of each of your turns. You may make this saving throw against any effect currently afflicting you with a duration longer than Instant which offered an initial saving throw to negate its effects. On a success, the effect in question ends. This bonus save is in addition to any other saving throws you might receive. Additionally, whenever you use your Second Wind class feature, you can make an additional such saving throw immediately.

Primal Resurgence
No matter how many times they may be beaten to the earth, the mightiest of wardens rise ever anew - greater and more determined than ever before. Beginning at 18th level, whenever you use your Second Wind class feature, you are restored to your maximum hit point total rather than regaining a fixed quantity of health, and the saving throw granted by Font of Life is an automatic success. This does not apply to the start-of-turn saving throw offered by Font of Life, which is resolved normally. Additionally, you can use your Second Wind as a reaction whenever you take damage or fail a saving throw, rather than using it as a bonus action.