Something Big Is About To Happen.

Origin gods are very powerful beings. If a titan can be likened to an exploding star and a sovereign is someone that has gained control of the star such that they can control the intensity of the explosion, then origin gods have gained perfect control of that star. They have perfect control of the star because they have become one with the star, so the matter of control is a foregone conclusion. The amount of energy they contain is something that is above the safety levels of a plane, that is why they face a huge amount of suppression in planes. If an origin god were to explode, it might lead to a catastrophe powerful enough to wipe out all life forms in the entire plane. That is if the plane isn't destroyed. Origin gods are that dangerous, even the ancient battlefield suppresses them but not as much as the planes.