Survival, Game!

Yao Zhenwu came to the survival game he was playing. He was lucky enough to get two diamonds on the first day. On the second day, he had a companion. They depended on each other to survive, and no one could live without the other! On the 100th day, they ushered in a boss. How should they deal with it? What method will be used to defeat the boss? His brother is also his survival companion: if they are separated, they will definitely try their best to return to the survival game...