Path of the Symbiont
Symbiont Barbarians utilize the potent energies of life and symbiosis, the domains of the Symbiont Syndicate. In the Syndicate, Symbiont Barbarians serve as elite strikers who dispatch enemies of the Symbiont with ruthless and bloody efficiency.
Symbiont Speech
Starting when you choose this path at 3rd level, you can speak, read, and write Symbiont. Symbiont is a special language. You can use Symbiont to write and speak with Beasts and Plants, as long as the Beasts or Plants you attempt to communicate with have an Intelligence of 2 or higher.
Symbiotic Rage
Starting when you choose this path at 3rd level, you assimilate with life around you as you rage. While raging, you gain the ability to assimilate with the enemy to reduce the effectiveness of attacks against you. Until your rage ends, you gain resistance to the first type of damage you take while raging.
Vines of the Symbiont
Beginning at 6th level, you can cast the thorn whip cantrip, even while you are raging.
Greater Symbiont Vines
Starting at 14th level, when you cast the thorn whip cantrip, you can pull creatures of up to Huge size toward you, as detailed in the spell description of thorn whip. Furthermore, you can add your Rage Damage bonus to the damage of thorn whip when you cast it.
An original homebrew by u/Arcane_P34 (Reddit), Feruchemist (GMBinder), Aebir-Toril (ENWorld).