Listening to the words of the day, the modern history of the Demon Realm gradually appeared in front of Feng Yuji's eyes.

Nearly a hundred years ago, the Demon Realm at that time was still relatively smooth, the sun in the sky was not purple, and the earth was not scorched.

At that time, the races in the Demon Realm were as prosperous as they are now, 'Sheep's Horn Ghost Beast', 'Ancient Tooth Beast', 'Red-Faced Demon', and 'Copper Spotted Stone Demon'.

'Megalodon', 'Scythe Troll', 'Black Radiant Destroyer'.

'Hell Ghost King', 'Red Flame Monarch', 'Tyrant Lord'.

All kinds of powerful demons are under the banner of the three kings, and the so-called three kings are the legendary 'guardians', 'invaders' and 'prophets'.

The era of the Three Kings can be said to be the most prosperous period in the entire Demon Realm, because the Three Kings support each other, and there is basically no fighting.

But misfortune soon struck.

Found a powerful, hard crystal in several large areas of the demon world, these crystals are so beautiful, so hard, whether it is used to cover the armor of warriors, or to make weapons, it is an excellent choice.

Under his strong leadership, this crystal was quickly implemented in the military headquarters and became the regular standard equipment of the Demon Army.

However, the hearts of the people are not enough to swallow the statue, and the invaders began to take the lead in making this crystal into a new crystal warrior, hoping to fight in place of the brave warriors of the demon world, so that the warriors will shed less blood and die less.

The starting point was good, but the result was miserable.

The invaders and his king's researchers were the first to develop four Crystal Warriors with autonomous lives, and then used their power to mass-produce more Crystal Warriors or direct battles.

In the beginning, the invaders were indeed invincible in using these crystal warriors, and some people or tribes in the demon world who had stubbornly resisted them were captured by the crystal warriors.

The Crystal Warriors fell down one by one, and with the use of their body fragments, the four Crystal Kings could resurrect them again, so to speak, an undead army.

Eventually, however, the problem arose.

The four Crystal Kings have mutinied.

Letting it manifest wisdom is the most amazing and, at the same time, the most stupid.

No intelligent being will ever be at the mercy of another being, and neither are the Crystal Kings.

Among the four giant crystal pits, nearly five million crystal puppet beasts were created by the four crystal kings, and then, they became independent.

A fire in the backyard is a terrible thing, and the angry invader once led his subordinates to kill three in and three out of the Crystal City, but he did not find the four crystal kings.

The invader Bi Jing is the number one warrior in the Demon Realm, and his strength is unmatched, but he has also succeeded in angering the four crystal kings.

The Four Crystal Kings looked at these crystal people made by them as their people, and they began to be angry when they saw their own people being slaughtered.

Fighting, it is definitely not possible to defeat the invaders, the four crystal kings know this deeply, if the invaders find their bodies, it is their death time.

However, how can the crystal kings, who carry the wisdom of the invaders, sit still and wait to die?

They began to learn the strategy of the invaders to clean them up, and sent a large army to harass ordinary demon civilians, and the disaster began.