Unique defense tower: the rail gun
The basic idea of the rail gun is that it moves along rails that have been placed on walls. It will be destroyed when a wall is broken and it gets derailed. The rails must be in a loop. Multiple turrets can be placed on the rails. It does not have to be an actual gun! Look at my comments and those will explain a little bit about what it could look like. It could look like a cannon on a metal box with wheels, an archer on a platform with wheels, or anything that shoots. The rails would look like normal rails.
Alternatives due to comments:
Instead of a rail it would move along a grove/cap in/on the walls. It would only be able to move on one row of walls (45 and 135 degrees). It would be called something like catapult, sorry if I got the name wrong. It would be filled with dark elixir but would not be like the X-bow. Only one catapult per wall section.
Cost of rails: 25,000 gold each
Movement speed: 16
Cost of turret: 300,000 gold each
Damage: 20
Health: falls off rails when derailed.
Turret max: Two for level seven town hall and three for level nine town hall.
Max rails: infinite
Max upgrade: 6
Range: 7
Upgrade increases: damage by 7 and costs 350,000 more gold each level
Movement patterns can be set for each turret. Turrets can be placed anywhere on the rail.
Please post any comments, questions, or ideas you have for this thread.