No matter how far one travels through the vast boundlessness of space there is only one constant in every universe that must remain the same.
The gods, immortals, or whatever they might be called, are not to interfere in mortal conflicts for any reason.
They can feed on them, and some can start them with enough power and influence, but they cannot partake in the actual war itself nor can they assist either side.
The only way they would be permitted to take action would be if another divine force were to declare open war.
This is where the N'Kai come in.
Among the trillions upon trillions of races in the cosmos, they alone are the grey area between mortal and divine.
Billions of years ago, they were nothing but a small, weak race with numbers so few that they barely qualified as such.