This takes place in a different reality than that of the Warrior's Books, for obvious reasons.
In this reality, the clans did not move to a new location, and the old territories were safe from two-legs.
The usual Copyright jibjab - Warriors is copyrighted to Erin Hunter, etc, etc, and so on.
Hawkfrost was not satisfied in his ambition, as he wanted to be clan leader, and he attempted to kill the Riverclan leader Leopardstar.
He was banished for that, and he left the territory with some of his followers, swearing to create new clans.
He brought his mate, Snowfoot, and seven other cats from all of the clans. The band journeyed far and wide, far from their home, until they came upon a series of mountains that seemed as if they'd never stop.
They decided to climb over one of the smaller ones, and to their surprise it led the way into a deep valley, almost perfect for the purpose of founding more clans.
Hawkfrost named it hawk Valley, after himself.
The band of nine explored the vast territory, and dully settled the territory into four different clans – Cliffclan, Dawnclan, Stormclan and Leafclan.
At first, the band simply lived in the smack middle of all of the territories, their number being so few.
They explored, finding a lake, some twoleg residences, a small thunderpath by the lake, a gathering point, and even a place to communicate with Starclan.
They lived like that for a year, maybe two and their number grew as some kittypets and loners were recruited and kits were born, and then raised into warrior hood. In this way the new cats began to learn the ways of clan life, and so it has been.
Eventually, after maybe three years they had more than enough cats to move into the four territories.
Clan leaders were chosen, Hawkstar for Cliffclan, Mottledstar for Dawnclan, Skystar for Stormclan and Yellowstar for Leafclan.
Hawkfrost soon grew tired of being equal to the other leaders, though, and attempted to try and claim it all for himself.
He was killed in a battle with his daughter, Icebird, and the clans once again settled into relative peace. Icebird left Hawk Valley, to search for the original clans.
Cliffclan's territory was for the sure-footed and strong, as it had many borders to defend. It's cats became known for the strength and balance.
Dawnclan was an open territory, close to the lake and with tall trees. It's cats became known for the swiftness and ability to swim in the lake.
Leafclan was close to some Twoleg nests, a barn, and was hilly and had trees. It's cats became known for their mixed lineage and bravery.
Stormclan was the most peculiar of the territory, with tall trees all around and a habit to attract the worst storms. It's cats became known for their ability to survive in any kind of weather and their climbing ability.
This roleplay takes place many, many, years – maybe even ten (although the exact count has been lost) since Hawkfrost's band first settled there.
It is a land of prophecies, as a Starclan dwells there too, and although a little bit different than the original clans, as the territory was bigger, the two if they ever met could mingle freely.