In the middle of the woods in broad daylight, the Adult Eren Yeager and Frieda Reiss stood before and gazed at large tree in front them, which stood thirteen meters high. The two Titan Shifters were currently in the past-all the way back during the Era of Ymir Fritz. Eren was dressed in his Survey Corp. gear as if he was prepared to kill Titans, while Frieda dressed herself in a green trench coat. They used the Founding Titan ability to travel all the way back to the day Ymir Fritz became a Titan.
"Um, Eren? If you don't mind me asking..."
"Go ahead." Eren said.
"Why have we come out this far to this timeline?" Frieda asked.
Eren paused for a moment and thought of something while staring at the tree. He remembered meeting his father, Grisha by the front of the castle, Mitras.
Flashback
"You wanted to speak to me, dad?" Eren asked Grisha.
"Yes. I want to talk to you about something that is very important." Grisha stated.
"I'm all ears." Eren said, casually.
"I don't know if you have been receiving visions, recently. But last night, I had just received one. And it's very important."
"What was your vision about?" Eren asked.
"It's Zeke. He's coming to the walls, soon." Grisha said.
Eren's eyes had grown big at least a centimeter.
"If I remember correctly, he should be coming within the next month or so." Grisha said.
"That's great. You finally get to redeem yourself within Zeke's eyes and you also get to make up for all the years you missed."
"That is true. But I'm afraid that I won't happen. I won't be able to meet him by the time he arrives on Paradis." Grisha said.
"Why is that?"
As soon as Eren asked the question, Grisha reached into his right pocket and pulled out a white handkerchief in front of Eren. It had a small stain of blood on it. The handkerchief made Eren think back when he saw Eren Kruger cough up blood through Grisha's memories. This alone made Eren Yeager's eyes grow big as he knew his father was slowly dying. His body did not react in the slightest.
"I'm afraid I have less than a month. As the Curse of Ymir continue to slowly eat away at my life force. Which means... I won't be able to watch your younger counterpart grow up. I won't be able to see Zeke in time... I won't be able to grow old with Carla, nor watch you marry Frieda..." Grisha in a sad tone. "And also, I won't be able to-"
Before Grisha could finish his sentence, Eren placed his right hand on his left shoulder.
"Leave it to me. I have a solution." Eren said as he made eye contact with Grisha.
End Flashback
"To save my dad from death's door." Eren told Frieda.
Frieda gasped. "You mean..."
"Yes. My dad has half a month to live. And this is the only solution I have in saving him. Ymir Fritz is the only one capable of undoing the curse." Eren said.
"I see..."
Eren then pointed at the dark cave-like whole within the large tree. "Do you see that dark hole in the tree?"
"Yes."
"Inside that tree is a bottomless lake. And inside that lake is a powerful specimen called..."
"The Source of All Living Matter..." Frieda finished Eren's sentence.
"Right." Eren nodded. "In a few hours, Ymir Fritz is going to be hunted down like a wild animal. Just because she released a bunch of pigs from their pen. As she's being hunted by her captors, Ymir will find this tree and will try to take refuge in it."
