the user merges an arrow with a seed and creates a projectile that takes root on impact.

this rooted plant does 1D12 necrotic damage per turn to whatever it hits for five turns, or until it's burned or poisoned. if it misses it grows, it knocks everything within 5 feet prone until they leave the radius and stand up. it also deals 1d4 bludgeoning damage to everything within a foot  until it's full grown.