Here is another installment of exTRAPaganza, our Thursday over-the-top trap series.
The castle is made up of several discrete towers, each situated on its own outcropping of rock. They are all interconnected by rope bridges suspended high above the rocky, crashing waves below.
Unless authorized by a castle warden who can disable the effect, when a bridge is crossed, a huge gust of wind will rock the bridge. Those on the bridge must make hard Dexterity saving throws of fall off the bridge, taking anywhere from 3d6 to 10d6 damage and landing in the ocean and rocks below.