The will of the plane can see everything happening in the plane both the surface and the Underdark so it probably knows where Ragnarok is. But it cannot do anything with the information it has. There's no faction for it to order around to do its bidding. At least not yet.
As for the demon god of Carnage, its main body, or at least the body it is using to attack the plane is still outside the plane. It can only rely on its spawns to serve as its source of vision and also its vague sense of life.
Ragnarok would have been better hidden from the demon god in a crowd of living things. But he ran to the end of the plane where there is no life whatsoever. His life force shone to the demon god like a torch in the dark.
The torch was hidden here by something but the demon god can still sense the heat from the torch. Ragnarok also left a trail of energy and life that ended abruptly at the base of the mountain. All these clued the demon god to where Ragnarok might be.
"He is within this mountain. You have to break it down." The voice told Xigger.
Xigger nodded. He manifested his domain immediately. A sea of blood appeared beneath him. It is a large body of blood kilometers in size. He was about to fashion the sea of blood into a weapon to smash the mountain when the mountain began to move on its own. The mountain broke apart to reveal 100 unknown entities.
"What are those things?" He asked.
He called them things because, despite the fact that they are moving, he can't sense any life in them. And he is an expert in identifying living things so he should know when something is living or not.
The voice in his head exclaimed, "No way."
"Are they ice elementals?" Xigger asked again.
"No. They are not elementals. They are golems. Calling them that is even too good to be true. Golems should have energy circuits with energy flowing through them. But these are just a clump of ice-given life."
"If I didn't know better I would think they are lifeless marionettes that are too big. They must be the handiwork of that white bitch. I didn't even sense them so close. They must belong to the white bitch. Only she can make life hidden from me in this plane. That must be how your son became hidden."
Xigger didn't need further confirmation. He saw Ragnarok appear from amidst the colossal ice golems. He became relieved immediately.
"Did they capture him?" He asked.
"I don't know. But I do know that they won't allow you to reach him and that wood elves are catching up to you as we speak."
The demon god didn't lie to him. It knows more than it let on. For example, it knows that the ice golems are here to protect Ragnarok from it. It also knows that the wood elves and the white bitch aren't exactly a single force or faction.
If the wood elves and the fountain of life were close and if they worked together, then the wood elves would have caught up to Ragnarok all these years. After all, the white bitch knew about Ragnarok but didn't tell the wood elves all this time.
But Xigger doesn't need to know all of that. All he needs to know is that he has enemies both behind and in front of him and that they are running out of time for him to get his son. That was enough for Xigger. He attacked immediately.
The sea of blood swept forward. It expanded and rose high into the air like a tsunami. The ice golems rushed forward to engage. The two sides clashed immediately.
Ragnarok saw all this happen and couldn't help but be unhappy.
"What is this guy's problem?" He asked himself in exasperation.
He is more concerned about the presence of Xigger than the Ice Titans. The Ice Titans are unexpected but they are exactly the type of enemies that can suddenly appear. Xigger on the other hand is the enemy that shouldn't appear.
"So I killed you once and you chase me to the end of the world." He grumbled. "You are an ancestral vampire, you can literally get over it but you didn't."
Then he looked around him at the ice golems. "I don't even know where to begin."
He truly doesn't know what to think or ask about these colossal beings. They are the danger he felt but he felt them only because they began to move. He would have remained ignorant of their existence otherwise.
Fortunately, what he thinks about the situation is not important right now. He is surrounded by beings that are much stronger than him and that's what's most important.
He also noticed something really important. That is that he is being ignored. The Ice Titans are rushing forward to fight Xigger the persistent ancestral vampire that won't let a grudge go. So he chose a direction and ran.
He doesn't know why the mountain is formed of Ice Titans or why the Ice Titans are fighting the ancestral vampire but he doesn't intend to find out. His curiosity isn't enough to make him stick around anymore.
The two parties are at least at the king of law level and he is a mana entity that can give lords of law a run for their money. He is outranked and outmatched right now so he chose the option that his sense of self-preservation dictated.
Xigger saw Ragnarok run away and he became even more relieved because he could go all out now without worrying about injuring his son. He retrieved the blood domain back to himself. The sea of blood fell onto him and wrapped him up into a red armor. The armor itself is a malleable liquid in the shape of a colossal four-legged beast with wings made of blades of blood.