Martial Arts Era: I Became A Twin After Rebirth

At 0:00 a.m. on January 1st of the year in the Wuling Era, heavy rains without warning swept across the world, lasting for three days and three nights, causing immeasurable losses. After active rescue efforts by various countries, order was barely restored.
This disaster is also an opportunity: the surviving pet livestock and a large number of animals and plants have mutated (for example, an abused baboon grew in size, crashed the house and seriously injured its owner and fled into the mountains), the plants became more active and aggressive, and many buildings became their paradise.
At the beginning of the second year of the Martial Spirit Era, towering Martial Spirit Towers appeared in various places. When people approached them, they would be baptized by a special light and transform their bodies. Some people would also awaken the mysterious Power "Martial Spirit".
Special light shines on the earth, speeding up the growth of all living things, including humans.
At the same time, the Wuling Tower also brings new challenges. The selected ones will undergo the trial of the Wuling Tower. The Wuling Tower that does not have survivors will automatically dissipate, and at the same time, the mysterious passages that are blocked will also be opened one by one.
Since then, the Wuling Era has officially begun. This is a new era, the Wuling Era.
As the protagonist, my name is Xia Yi. I was reborn and traveled to this era by accident.
When I opened my eyes, I was three years old again. I thought it was just an ordinary Rebirth. I was reborn as three years old, but I found that my brother, who was the same age as me, was brought to me by my mother. I was no longer an only child, but had a twin brother who was exactly the same as me.
The bond between us was born from then on.