Compared to the unknown Defiler, the Corpse King naturally trusts the Undead Monarch Okas more. He is a seasoned Demon Lord, at his peak, he was one of the Abyssal Three Giants alongside Demon Prince Demogorgon and Prince Grazte of the Ubar.
Even though he is at a low point in his life now, a lean camel is still bigger than a horse. He remains beyond the reach of ordinary Demon Lords, let alone comparable to someone who has just entered the God's Domain.
Even if the Defiler has occupied most of the Plains of Bone, he has only taken a small part of the 421st layer, and cannot yet be called a Demon Lord, at most a Secondary Demon Lord.
The only problem now is that the mind of the Undead Monarch is notoriously difficult to fathom; no one knows if or when he will react.
Don't wait until he reacts, and find yourself already a sacrifice under the Defiler's control over the Plains of Bone.
