Vineborn Constitution: 

The Vineborn gets 10+constitution bonus temporary hit points each morning. These last until the next morning. They stack with other points of temporary hit points. 

Grappling Vines: 

The vines can be extended to grapple on to objects 20 feet away. This can be used to pull the object closer, or to climb. The VIneborn gets proficiency in acrobatics checks. 

Grappling strike: 

15ft reach, Dex proficiency to hit, 1d6 + dex + proficiency slashing damage. ON a successful hit, the target is grappled. The target can make a check on each of their turns to un-grapple themselves, as per normal grapple rules. 

Loyal In Death: 

Upon reaching 0 hit points, the Vineborn turns into a Vine Horror (i have the stats.). The Vineborn can't be resurrected until the Vine Horror dies.