The Messages of the Gods
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Eren Yeager was staring into the swirling abyss of flesh and blood beneath him absent minded, mostly due to fact that he's been passing through this carnage for almost an hour now. The other reason was because so much is weighing on his mind. So much of this world's fundamental core had been changed and altered over these past eighteen months it's hard to even recognize it. Beginning to doubt his decisions, Eren recalled his objectives. Or should I say objective. Because Eren was so simple and straight forward, he had but one goal which was
[Eren: Freedom.]
That one word was the only thing that could restore peace to his soul and calm his spirit. That word has to be the most beautiful one to ever leave someone's lips; like a poem, its majestic rhythm was even relatable to infants, but its philosophical deeper meaning was unsolvable by even the world's greatest geniuses. With renewed strength, Eren restated his vow.
[Eren: Everything I do is for their sake. I am free, and I won't stop until they are too]
He had to. After all, what kind of leader, friend, or brother would he be otherwise? After renewing his convictions, he knew exactly what he had to do. He actually figured it out long ago. Kill the Titans, kill the enemy beyond the sea, kill the rebels, and now, kill a devil. That's all it ever amounted to. Kill the enemy and you will be free, but it was never true. He killed the titans, and Marley appeared. He killed Marley and the world attacked, so he killed them too, after all, it's a natural response. But a new enemy always appeared. This time will be different though. If another enemy appears, he will change his view. If there is another enemy beyond this devil, he will view the whole world as the enemy and kill everything in his path. Maybe then he and his Empire will be free.
Just as Eren was thinking these thoughts, he arrived at the place he was looking for.
The world around him was covered in Titan flesh and blood, which was understandable considering that he was at the Coordinate Source of all Organic Material, or in other words, hell.
The best way to explain it is with an analogy. You see, when Ymir Fritz made the contract with the devil, all Eldians received a coordinate in their souls, which basically means they were each given a locked gate that leads directly to hell, a realm full of Titans. Since Ymir was given the power, she was also given the key to these gates, and by having any Eldian be injected with her spinal fluid she basically placed the key in the lock. Once the key is in, all she had to do is give the order and the gate would open, allowing some of the demonic flesh and blood to escape from the gate. Since it's a demon, it naturally wants to destroy all conscious self-aware living beings, explaining why they eat humans.
When a Titan loses a limb, more flesh passes through the gate to take its place, which is how they regenerate. Ymir could also use the key to control the titans, which gave her the ability to open up her own gate so she could transform into one as well. But when Ymir died, her key split into 9 different pieces, each with a different amount of control over the titans. The Founding Titan had the most control allowing it to control all pure titans and let hardened skin to pass through not only it's gate but other titans gate as well. The Cart Titan has the least control and can only control it's own gate.
All this was knowledge gained by Eren through the memories of previous key holders. Through these memories Eren also learned the way to reach this hell, and he began searching for the devil who created this curse almost immediately. He first received Ymir Fritz's memories after gaining his seventh key, which was the Cart Titan. All the keys he has now are the Founding Titan and Attack Titan he recovered from his father, War-hammer Titan which he stole, Beast Titan he inherited, Jaws Titan he stole then used its teeth to take the Female Titan, and then was given the cart after Cart Titan by a young boy on Paridis who received it once Porco was killed by the Rumbling.
But how he reached this place didn't really matter. All that mattered now was that he was here, and standing directly in front of him with everything from her shoulders upward covered in a black fog, and was known in her own Realm as Satella, the Witch of Envy, was the source of all his troubles, the Earth Devil.