Coquina Keep of Clown-nihilation

An entry in the tenfootpole Wavestone Keep contest! From the publishers blurb: The CKC is a magical coquina stone tower that floats along the sea coast on a wide barge occasionally making land fall. Sometimes it will randomly teleport unexpectedly across the sea or inland, such as appearing in the street in front of the Cs favorite inn. It was made by yet another mad wizard known as the Keepmaster for no particular purpose by to terrorize coastal communities with an invasion of lizard folk clowns when it washes ashore.