The change in Dravot and Carnehan's relationship from beginning to the end of the story is that they were very good friends but later their friendship begins to fall apart.
Explanation:
Daniel Dravot and Peachy Carnehan were two adventurers who wanted to become kings of Kafiristan. They were really close friends in the beginning of the story but as the story progresses, the friendship they share starts to diminish. The catalyst for the change was Dravot becoming corrupt with each passing time.
Initially, the men had decided to rule together. As the Englishmen do, they wanted to have an empire of their own. They had a written agreement between them that they would abstain from alcohol and women. It would help them concentrate better on the empire they were about to build. But later after they succeed in capturing an empire, Dravot went corrupt and wanted to have a woman in his life and wanted a royal lineage of his own. Moreover, he started acting as if he alone was the king, completely avoiding Carnehan. People started treating him as a God.
