Before they went to hunt other beings, they first ate the god of dreams and his souls. This granted them nearly 30,000 units of power, which they split between increasing the power of their divine body and the power of their divine souls.
This increased the power of their divine body and divine soul to 56,000. This is less than halfway to their limit, so they need to eat more divine beings.
They know the location of many godlings and subordinate gods through the memory of the god of dreams. Even if they didn't have the memory of the god of dreams, as the god of telepathy, it is very easy for them to find something. They can just check the minds of everyone in the world for what they are looking for.
The god of dreams hadn't dared to attack the subordinate gods of other gods. They don't want to offend other gods anyhow. So they targeted godlings who won't be missed and subordinate gods of the gods that they hate.
