Devil's Snare is supposubly not common, but certain florists or herbologists have immidiate access to it.
It is a mass of soft, springy tendrils and vines that possess some sense of touch. Using the tendrils and vines, Devil's Snare can ensare and trap any living thing that touches it, binding their arms and legs and eventually choking them to immidiate death.
The harder a person struggles against Devil's Snare, the quicker it'll kill them. The key to escape Devil's Snare is to relax and stay still and unmoving until it releases someone or just doesn't kill them as quickly as it would if they struggles against it.
Devil's Snare prefers a dark, damp environment and it will stop its movement in the environment in front of bright light and will recoil away from the heat of fire- a flame-spell such as bluebell flames will drive it away from its victims.