In 2030, the sun is dormant and the earth is once again ushering in the Xiaoice period.

The global temperature began to drop, leading to a tragedy in industry and agriculture around the world. The South Asian subcontinent, the Middle East and Africa, which depend on food imports, have suffered a severe famine!

At the same time, freshwater lake resources are gradually frozen, the energy consumption of groundwater resources is gradually decreasing, and the shortage of water resources on which human beings depend is becoming increasingly obvious!

……

In 2035, many areas will be frozen and resources will be severely scarce. In order to survive, people in poor areas began to invade other areas to plunder resources.

The following year, the third world war began due to disputes and competition for resources.

At the beginning of the war, the flames of war burned only in resource-poor areas. But there are those who hope that the war will spread, and the battlefield will be like a shopping mall, from which merchants can make huge profits.

As a result, these businessmen fanned the flames under the slogan of freedom, openly supported the armed forces inclined to their camp, and called on more people to fight for freedom, forming a close alliance, or "pro-alliance" for short.

……

In 2038 AD, with the pro-alliance gaining momentum, the geopolitical countries in the war-torn area had to join forces to contend with the pro-alliance and form a geopolitical alliance, referred to as the "local political alliance".

Immediately, the flames of war broke out everywhere, permeating the "two oceans, three continents and five seas," causing the war to become more and more intense and the situation chaotic.

However, the businessmen who had initially instigated the war made a lot of money, and they hung up on the chaos in the war-torn areas, and the situation became out of control.

In October of the same year, after obtaining a large number of advanced weapons through the channels of these businessmen, the pro-alliance launched an all-round attack on the local political alliance with the integration of land, sea and air, causing heavy losses to the local political alliance, which had relatively weak military strength.

In March of the following year, the war of the local political alliance deteriorated, and it began to face up to the gap in strength between itself and the pro-alliance, and turned to guerrilla warfare, constantly attacking and harassing and even committing suicide attacks on the pro-alliance, which made the pro-alliance military confused for a while, and the situation was stalemate.

In May, out of strategic considerations and interests, a certain nuclear-armed country privately resold nuclear weapons that required a lot of money to be maintained to the allies, which made the war situation instantly clear, but also caused the nuclear weapons to be put into a deserted no-go zone within a radius of 1,000 kilometers.

……

In January 2042, when all mankind was concerned about the "Three Wars" where the balance of victory had fallen, the beasts in the forbidden zone were genetically mutated under the influence of nuclear radiation, which made the spiritual intelligence open, the body changed, and the combat effectiveness was greatly enhanced.

These mutant beasts have been raised in the forbidden area, and the population has increased dramatically, and the limited living space resources are limited, which promotes the migration and distribution of the population to obtain more resources.

Subsequently, the alien beasts began to appear in human territory, competing for land resources, and penchanting cannibalism.

In the ocean, due to the pollution caused by the nuclear accident decades ago, marine life has also undergone abnormal changes under the long-term influence of nuclear waste, accelerating the opening of their intelligence and the change of their body structure.

Then, the intelligent sea monster integrated the entire marine world. They hated humanity to the fullest, remembering the brutal killing of their fellow human beings, and thus embarked on a devastating retaliatory strike against human activity at sea.

In March of the same year, the "Three Wars" came to an end, and the alien beast population appeared on a large scale, conquering many human territories. The sea is also completely occupied by sea monsters, and they continue to invade the continent.

Countries suddenly felt a strong crisis. The human population has been sharply reduced due to the war, and now it is threatened by alien beasts and sea monsters, which has caused the human survival circle to shrink, and there is even a crisis of extinction!

This is by no means alarmist!

In April, the neutral Europa Alliance, the Chinese State, and the United States intervened at the same time to mediate and end the "Third World War".

Although the war was forcibly ended, many countries in the South Asian subcontinent, the Middle East, and Africa have disappeared because of the war, or have disintegrated into small states due to differences in beliefs and ethnic disputes.

And these weak states are powerless to stop the attack of the alien beast army, so that the human territory is constantly being devoured. Wherever the beast passed, no one survived!

In March of the following year, after ten months of preparation, the United Nations Army, composed of countries from all over the world, finally sounded the horn of mankind's counterattack against the alien beast!

Immediately, World War IV broke out. And this time, it is a battle for survival between humans and alien beasts, which is related to the survival of the race.

However, what mankind did not expect was that at the beginning of the war, humanity was in an absolute weakness.

As soon as the plane was dispatched, it was destroyed by the birds of prey with their lives, making the air supremacy completely fall!

And the steel battleships in the ocean, the sea monsters still remember vividly. In the early years, sonar pollution and crowd hunting caused heavy casualties among their ethnic groups, and they were already furious. Now they have the power to crush the steel battleship effortlessly, and even the aircraft carrier is unbearable to the giant sea monster crashing and falling, making the navigation right completely lost!

Land is limited to the use of conventional weapons, and the sphere of survival has already been narrowed, and if nuclear weapons are deployed again, it will create more no-man's land, further shrink the sphere of survival, and even bring new threats of mutated species.

So soon, human beings were soberly aware of their own weakness. Mechanized weapons are overwhelmed by the thick-skinned, fast-moving intelligent alien beasts, often crushed unilaterally.

The genetically mutated beasts have greatly increased in agility, strength, and speed, and even some high-level beasts have mastered the laws of nature, and they are unstoppable.

In April, humanity was defeated and unable to fight again, so it was forced to switch to the strategic defensive phase, and retreated to a city with tall walls, struggling.

Since then, mankind has entered a dark age that may be invaded by alien sea monsters at any time, and it is known as "Apocalypse Twilight".