After the decline of magic and mythology, technology and machines rose.there is never a shortage of inhabitants in the dark world. The heirs of these evil wills have been threatening the settlers from earth civilization.

▲ You need to familiarize with your arsenal
Machine gun is a short-range defense unit, attacks aircraft and footman.
Cannons, artillery and laser are medium-range weapons against heavily armored tanks, robots on the battlefield.
Rocket launcher and Cruise missile are long-range weapons against densely formed zombie legion.
Air defense sites attacks jet fighters beyond-horizon, intercepts starship in space.
Shockers can paralyze the squad on lands.
The laser turret can intercept 3 aircrafts at the same time, e.g. artillery shells, jet fighter, biochemical dragonfly.
Wormholes can weaken the armor of giant war machines, e.g. titan, warship.
Satellite is an advanced defense unit that can boom space fleets.
The main fort unlocks tech level of your camp.

▲ Energy stations generate gold coins within fixed period of time, once placed, they cannot be moved
Defensive buildings can be strengthened and be repaired.
Research institute can upgrade the armor, attack power, and AI of troops. They accumulate energy, release skills(protective shields),strengthen the abilities of machines within range.
Auxiliary sites cannot be upgraded.

▲ In every new level, enemies with new abilities will appear
You can freely place defensive towers on the map, along the path that raiders come from.

▲ Some information about the Dark Legion
Biochemical spiders and robots are fast-moving units.
War machines, e.g. tanks, titans, battleships, and aircraft carriers are heavy armored.
Air offensive units, e.g. hovering swarms, jet fighters, penetrate defenses from the air and launch missiles to attack
Invisible units will penetrate silently, what you need is a sonar site.
There are electromagnetic special operations units, such as detonators that paralyze targets.
Bomber can carry out dense carpet bombing
The transport aircraft can drop all kinds of combat weapons, e.g. biochemical spiders, robots, tanks, laser cannons, and swarms

▲ Each level has 5 stars. The higher the star level, the more waves the enemy will attack. You need to establish an advantage as soon as possible.
You can select an enemy. When the target is killed, you will get gold coins as a reward.

▲ Unlike the tower defense mode, in the clan battle, as top commander of legions, you need to choose mobile tanks instead of building defensive sites.
Decide the crusade strategy, make a balance between Land and Air Force, heavy armor units and mobility units, then wage wars.

It is a total war to save the world against Dark Legions, good luck, commander.