This defense require only 1 Square/ Tile of space to be placed and Customizable Area Pointer, it's basically a defense in troop form, Here is the Picture Idea.
It didn't come from Clan Castle, It's Defense Troop. He can going around the layout in customizable area (This means you decide it's area to go and attack the enemy) You can set the area to FULL LAYOUT or small in the center of your village, but becarefull because Baby Dragon Defense is Only 1. Upgraded Version only increase it's attack !!