Activate the trap that is located in the inner part of the island. Then, the trap function produces a magical fire that emanates from the device, slowing movement of those passing above it and setting them afire.
This device has the same effect on allies so it must be carefully deployed... Used correctly there is no greater defense for a castle.
Of course, quality has its price...

Deploy the device east of the castle
Deploy the device west of the castle

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