The Tree of Life's 12 guardians are scattered in the 12 universes. Each with different lives and stories. Thus, the Red Force travels in each of those different universes and tries to capture them. They have failed in 11 universes which resulted in all those from all 11 universe's 12 guardians remembering their past and returning to nurture the Tree of Life. Now they all wait for their Dawn to return- Chen. This story is also available in AO3 User- FarToGo_00