To survive, you must defend your self-made defense and destroy anything close to it with every ability, even using all weapons until they are exhausted. Because the character will be in a defensive stationary state, you must know how to prioritize the target, help loosen the enemy’s attacking units, and slow down the destruction of the barricade. In the future, preparing or strengthening defenses will become useful and necessary for you to survive tomorrow and face the worst you have ever seen.