My second brother Feijian is invincible in the world

After traveling through time and becoming Senju Tobirama, he found that the ninja world he had changed began to become strange.
After he successfully rescued his two younger brothers from five adult men who were besieging them,
Every time the two younger brothers went out to do a mission, they would always be easily attacked by five grown men!
After he changed his eldest brother Hashirama's first encounter with Madara by the river during the day, the eldest brother preferred to run out to meet Madara every day at night.
After not using the Flying Thunder God Slash to kill Uchiha Izuna, this guy always wanted to let him use the Flying Thunder God Slash to chop him, and he was confident that he would never be wiped out by his sword!
After the establishment of Konoha Village, Tobirama, who did not want to study shadow clones, did not want to manage the village, and just wanted to rest, discovered that the entire ninja world began to undergo drastic changes!
The most terrifying thing is that my eldest brother Senju Hashirama tells others every day:
My second brother Feijian is invincible in the world!