With the promise that the Great Ancestor Chu Yuan of the Dragon Clan would intervene once, the Dragon Clan began their own journey towards dominance.
The Dragon Clan didn't declare war directly on any Race.
Instead, they "intentionally" leaked the information that the Great Ancestor of the Dragon Clan would only take action once.
This caused unrest among all the Races, especially those inimical towards the Dragon Clan.
They feared that the Dragon Clan would point their spears at them.
Knowing that the Great Ancestor of the Dragon Clan would only intervene once, they understood that the chances of their own Race's survival were significant.
Therefore, they did not entertain the thought of a fight to the death with the Dragon Clan.
In this situation,
The Dragon Clan began their invasion of the various Races.
The Dragon Clan didn't overdo it but invaded the others with extreme caution step by step.
The Dragon Clan played this hand very smoothly.