A hedge of thorns bursts up on an empty square: your opponent cannot enter any of the 8 squares around it for their next 3 turns, and any enemy piece already caught in that ring is snared and cannot move for its next 2 turns.
You draft Thorn Barrier in Buff mode. Activated: you choose when to use it, and using it is your move for that turn.
As a protection card, it shields a piece or bars squares from the opponent.
“Grown too fast to climb, and it grabs what it can reach.”