Ragnarok's existence is like someone stealing the Chaos spark from Aeternus and using it to evolve without swearing loyalty to him. It is absurd and should be impossible. The ability to evolve subordinates is under the domain of the Oath of the lord. The Oath is not a formality. It is a necessity for the subordinate to be compatible with the life essence of the Lord so that there won't be rejection.
A lord can't force someone to evolve with his energy or any other power from their life essence unless they swear that Oath. That means the demon god can't even give away its heart of Carnage for free without any attachments even if it wants to. If Ragnarok can bypass all of that, what's stopping him from killing Marlinto for good?
"If you are right..." Drastoic started. Then he paused. He rephrased what he was about to say. "Since you are right, then Ragnarok is truly a threat to us. What if he refuses to ally with us?"
