Power Tower

Summary
Size 2x2

Power towers increase the damage of nearby towers. Upgrade them to further increase their boosting power.
 * Power towers increase damage of nearby towers. If placed near towers that do not attack (such as another power tower) they have no effect.
 * If a power tower is destroyed, nearby towers stop benefiting from it's effects.
 * Power Tower Bonuses are cumulative, meaning 2 or more Power Towers can affect the same building.