Because their task time was limited to just over a year, they had to complete a project that would help most of the beastmen on the Tianye Continent survive the Ice Age before the next winter. Relying solely on their group of fifty people was certainly not enough, so they had to mobilize the beastmen of the Tianye Continent to join them.
And the only ones who could mobilize all the beastmen of the continent were the Four Great Tribes. As long as they were involved and they reached out to the other medium and small tribes for cooperation, their efforts would be doubled.
Yan Mo and Xia Yue patiently explained the situation to the members of the Four Great Tribes.
Being Clan Leaders and Priests of the Four Great Tribes, they were certainly capable of understanding, and they quickly grasped the meaning of what Xia Yue and Yan Mo were saying.