Al'Katra was the homeworld of the Nox, and the Nox Emperors naturally wouldn't leave it alone.
Despite the fact that all four of them lived off-world, they split the world into four territories, each of which held a force that belonged to them.
Though, it wasn't as if these portions were equal.
Of them, the Soul Emperor and Inhuman Emperor had the largest claims. This had nothing to do with strength, but the fact that the two of them had the largest forces among their peers.
Next was the Karmic Emperor. His force wasn't as large as the rest, but it was still substantial. After all, he needed manpower in order to execute his schemes and enforce his will.
The emotional manipulation he partook in was mostly done through Supremes who carried a portion of his power and consciousness, essentially puppets for him to control.