The demon god knew that Marlinto was probably going to die when Ragnarok showed up in his territory. But it didn't warn the Primogenitor or tell him to escape. It is all to acquire more information about Ragnarok.
It is not angry about Ragnarok's rejection even though it risked Marlinto's life for information because it is confident of victory. It is a confidence brought about by grasping the whole situation in its hands. After all, it literally has the whole plane in its grasp.
Ragnarok continued, "I have no intention of enlightening you. This meeting is not for that. You know what I want."
"Yes. I know that. You want to leave this dying plane. You also want me to swear that I won't come after you. I thought Marlinto gave you my answer to that question."
"That was before. Now I am about to kill one of your Primogenitors and can kill more if you refuse me. What is your answer now?" Ragnarok asked.
It was the turn of the demon god to change the subject. It did so with a question. "Do you know why I haven't descended into the plane yet?"
Ragnarok decided to entertain the demon god. He shrugged and said, "The divine plane?"
"You are correct as usual. It brings back the good times we have spent together. How we quibbled and argued. I think back fondly on those memories. Have I mentioned that you are very intelligent?"
Ragnarok rolled his eyes. "I am intelligent but your question was easy. You are obviously out there in the void. The only thing stopping you from entering is the divine plane. It is not about intelligence but information."
It said with a chuckle. "You must forgive my surprise then. It is after all impressive that a Warrog from a backward tribe, that is less than a thousand years old and has never left the plane is aware of the nature of gods, their divine plane, and its function in protecting the plane."
The demon god is insinuating that he is more than he seems. Ragnarok didn't deny or admit anything. He stared down the red skull with silence.
The demon god continued. "Now for the difficult question. Do you know why the Vampires have not been able to take the divine plane? Do you know why they are wasting their time fighting in the mortal plane instead of ushering their supreme into the plane?"
"I heard it has something to do with a god of light in the divine plane," Ragnarok replied.
"Correct again. I told you that if I remember that correctly. There is a Celestial of light in the divine plane. It has been weakened terribly because the absence of light has strangled its faith. But as long as it is still there, the divine plane will remain a restricted zone for vampires. So we are stuck trying to expand my will throughout the plane instead. I will gain access to the plane once I usurp the will of the plane. That was my only choice."
"The will of the plane decided to foil even that opportunity for me by creating a champion that can wield the power of light in the plane. Things were at a dead end for me until I could break through the divine plane. But then you displayed enough power to fight a Primogenitor and showed yourself immune to the effects of the sun. I can only imagine how powerful you would be if you had the assistance of infinite blood power."
It paused before it asked. "What do you think my answer to your deal is now that you have this information?"
Ragnarok didn't have to think too much about the answer to that question. He knows that those on the path of perfection will get suppressed in the divine plane but not Vampires. They are like demons and dragons in that their source of power is not based on the universe itself. The suppression of the law matrix and the authority that comes with it doesn't affect them. So Vampires ought to be able to kill gods in the divine plane.
They are a little weak to divine energy more than those on the path of perfection but that's only if they get injured. It becomes another story if there is a Celestial of Light in the divine plane. Vampires will get injured as soon as they enter the divine plane. They are weak to light and divine energy. The combination of the two is fatal. Only someone without those weaknesses and who possesses immense strength will be able to threaten the divine plane so that the demon god can descend easily. There has been none until now.
Ragnarok replied, "I'm guessing your answer to my demand is no."
"Correct again. I wasn't going to let you go before. You broke my hold on you. As if that isn't enough, you even stole from me. How do you expect me to let go of you with those grievances? But I am a kind and merciful god. I am sure we can work something out. You have proven yourself quite resourceful after all. I will let you go after you help me gain entry into the plane."
"Are you sure about your decision?" Ragnarok asked calmly. "I will not ask again. I will try my best to make you regret it if you don't let me go."
"Imagine that. You think you can threaten me now that you have little power. How laughable." The demon god did laugh.
It roared in laughter. "How old are you again? Your entire lifespan is but an insignificant moment in my lifespan. I control powers far beyond your comprehension. Do you think you are capable of resisting me because you managed to escape from me?"
I don't think so. If you were so strong, you wouldn't need my permission to leave the plane or the guarantee that I would not come after you. Feel free to gallivant about like you own the place. You only have until I gain access to the plane so you should cherish your freedom now."