Warrior Cats: The Rise of Rockclan

A virtuous cat chosen as the role of leader. Ancestors of cats long before them roam the land of Starclan, watching over the four clans.
A sense of imbalance across the district of the four clans spread across Starclan like wild fire, and there was only one thing to do; appeal to a fifth clan.
Would the newly found leader be able to form a clan and keep it? Alongside gaining recognition and acceptance of the other four clans?

What happens if they are accepted as a fifth clan? Do they know full boundaries? Do they make any enemies or cause any problems?