Homebrew
Calming Fibers - If the leaves are consumed the creature must make a DC 15 Constitution Saving Throw or be knocked asleep for an hour. If the Flowers are consumed the creature must make a DC 18 Constitution Saving Throw or be knocked into a deep slumber for an hour, during which they will be paralyzed. Body Transference - The Main body of a Rampart Flooding Vine can swap locations with any Sub body. In combat this is a Bonus Action. Tsunami - The Rampart Flooding Vine's Main Body can use it's Constitution Modifier instead of Strength when attacking with it's lashes. Surface Tension - The Main Body and Sub Body can redistribute the damage they take to lesser allies (Vines/Sub Bodies)
Main Body Actions- Relaxing Pollen (Recharge 5-6) 1d6 - The Rampart Flooding Vine releases absorbent pollen in a 30-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 5d10 5d10 Necrotic Damage on a failed save, or half as much damage on a successful one. Crash (Recharge 3-4) 1d4 - The Rampart Flooding Vine commands the seeds within targets to surge forth and show themselves. If a target is Seeded they take 4d4+2 4d4+2 Piercing Damage and a number of vines equal to the number of their expended Hit Dice sprout from their bodies. Multiattack - The Main Body can attack twice per attack action. Lash - +8 to Hit, Reach 10ft, One Target- The Vines lash out towards a target dealing 1d8+5 1d8+5 Piercing Damage. Seed - If both Lash attacks hit a target the creature must make a DC15 Constitution Saving Throw. On a failed throw the creature takes an additional 1d4+2 1d4+2 Piercing Damage and becomes Seeded. On a successful save they take half as much damage. Sub Body Actions - Multiattack - The Sub Body can attack twice per attack action. Lash - +5 to Hit, Reach 10ft, One Target- The Vines lash out towards a target dealing 1d8+2 1d8+5 Piercing Damage. Swirl (Recharge 5-6) 1d6 - The Rampart Flooding Vine's vines start vibrating and colliding with each other. Each creature in 15 feet of the Sub Body, other than the Main Body and the Vines, must make a DC10 Constitution Saving Throw. On a failed saving throw, the creature become stunned for 1 round and take 3d6 3d6 Thunder damage, or half damage on a success. Vine Actions - Lash - +5 to Hit, Reach 10ft, One Target- The Vines lash out towards a target dealing 1d8+2 1d8+2 Piercing Damage.
Command - The Main/Sub Body can command the vines to target, which they will do until they leave the territory of the Rampart Flooding Vine, or until commanded otherwise.
Surge - The Main/Sub Bodies in combat can command their vines to emerge from the ground or walls and attack, adding 1d4+1 1d4+1 Vines into combat. Trough - The Vines within 30ft of a Main/Sub Body will wither and die, transferring their HP to the body.
Forest floors or anywhere with dense vegetation. Due to the main bodies weak constitution in early stages of life anywhere without plenty of cover and prey will often times spell the doom of a Rampart Flooding Vine. In an area with these conditions a Rampart Flooding Vine can flourish unimpeded, as such abandoned civilizations and caverns also serve as good territories for them.