Introduction of Defenders

In my game design, there are 7 buildings or defenders. Player can place them on anywhere in the battleground except the path for the enemies to run on. Don't talk so much, let's see those defenders right now!

Attributes of defender:
- Minimum Attack Damage
- Maximum Attack Damage
- Attack Range
- Attack Speed
- Upgrade / Power Cards
- Abilities

The defender deals a random number of damage in the range of minimum and maximum attack damage. Any enemy who goes into the defender's attack range will be the attack target. The defender with higher attack speed needs the lesser time to ready the next attack. Player can insert the cards into the defender's inventory to improve its status as well as gain new abilities.

	1. Missile Launcher This defender is the basic attacker that can only attack a target in one time. It can be upgrade to be a powerful attackers that can shoot multiple targets in one time. (Upgrade Name: Multiple Shooting)
	2. Laser Launcher This defender shoots a laser to damage a target. If other enemies move too near to the target and touch the laser, they also take the same damage. This defender can be upgrade to make its weapon to be more powerful. After its weapon upgrades, whenever it shoot a laser on a target. The laser leaves a trail on the ground for a short duration. Any enemy who walk through the laser trail takes damage as well as effects. The laser can damages up to a specific number of targets. (Upgrade Name: Laser Trail)
	3. Arrow Shooter This defender launches an arrow to a direction, dealing damage to the enemy units the arrow pierces in a line. Whenever the arrow pierces a target, it has 15 % reduction of the current damage to the next target. This defender can upgrade its weapon to shoot multiple arrows to a direction in one time. (Upgrade Name: Split Arrow)
	4. Dart Thrower This defender throws a dart to a target. After hitting a target, the dart bounces to the nearest enemy unit which is within its bouncing area and continuously bounces until it hits a specific number of targets. The upgrade of its weapon increases the throwing dart's number of bounces and the bouncing area. (Upgrade Name: Strikesmore)
	5. Lightning Catapult This defender launches a lightning ball to a location. When the lightning ball reaches the designated location, it explodes and deal damage to all the enemies in an area. The upgrade of its weapon increase lightning ball's area of explosion (Upgrade Name: Great Explosion)
	6. Shockwave Tower This defender strikes all the surrounding enemies which are inside its attack range. The upgrade of its weapon rises the chance for every attack to do an extra attack. An extra attack also has the chance to do more attack. Therefore, it can do several attacks at once if the chance of Multi-strikes is high. (Upgrade Name: Multi-strikes)
	7. Empowering Beacon This is a supporter for those defenders. Increasing the number in its status is giving bonus to those nearby defenders inside its area of effect. For example, this beacon has 10 point of attack range, it means that all the nearby defenders gain extra 10 point to their attack range. Its upgrade increases the area of effect. (Upgrade Name: Powerful Signal)