Battle of Heaven and Earth

"You turned your backs on Paradis in spite of being "island devils" to stand on the side of humanity to the end. You'd probably become the most respected beings in this world."

- Eren Yeager admits his foreknowledge of his defeat to Armin Arlert

The Battle of Heaven and Earth (天と地の戦い) was a final effort made by the Marleyan military, the Warriors, and former members of the Survey Corps against Eren Yeager in an attempt to bring an end to the Rumbling at Fort Salta. This resulted in the death of both Eren Yeager and the anomaly responsible for the Power of the Titans, ending of the Rumbling and eliminating the Power of the Titans from the world.

Prelude
Towards the end of the surprise attack from Marley on the island of Paradis, Zeke Yeager let out a scream that transformed many Eldians into Titans that quickly overwhelmed the surviving Marleyan soldiers. As Zeke went to reunite with his brother Eren, Warrior candidate Gabi Braun shot Eren in the neck and decapitated him; however, the Founding Titan that was residing within Eren saved him and due to Zeke making contact with Eren's head, both were sent to the realm where the spirit of Ymir Fritz resided. The two brothers tried persuading her to join them for their own means, but Ymir sided with Eren and caused the Wall Titans to break out of the three Walls on the island while simultaneously generating a new Titan body for Eren and imprisoning Zeke within the Paths.

Using the Founding Titan, Eren mentally sent a message to all surviving Eldians on Paradis that declared the Rumbling will begin and all the enemies of Paradis will be destroyed. Soon, all the Wall Titans began marching off Paradis towards the continent of Marley. Survey Corps Commander Hange Zoë and Levi Ackerman encountered General Theo Magath and Pieck Finger, the holder of the Cart Titan and decided to form a truce for now to deal with the threat both sides had to face. Hange and Levi managed to find and recruit Mikasa Ackerman, Jean Kirstein, Armin Arlert and Connie Springer from the Survey Corps and Warriors Annie Leonhart and Reiner Braun, along with Falco Grice and Gabi to try and stop the Rumbling; Jean and Pieck would use subterfuge to also take Anti-Marleyan Volunteers Yelena and Onyankopon with them to help with the efforts. Arriving at the port where the Azumabito flying boat was located, the assembled group infiltrated the Yeagerists stationed there and were eventually discovered; Reiner and Annie used their Titans, and Pieck and Falco joined as support with the latter transforming into the Jaw Titan for the first time. After they secured the flying boat, Magath volunteered to stay behind and sacrificed himself to delay the Yeagerists from catching up with the ship they were using; unbeknownst to any of them, Yeagerist Floch Forster managed to anchor himself to their ship and followed them to their destination. He fired several rounds into the ship's fuel canister but was swiftly killed by Mikasa.

As the group split up, Hange volunteered to stay behind to fight the quickly approaching Wall Titans and equipped themselves with several Thunder Spears. They then appointed Armin as their successor and the newest Commander of the Survey Corps. Reiner and Pieck went with the group going on the flying boat, but Annie wished to stay behind; Reiner apologized for his prior actions against her and asked Annie to guard Falco and Gabi while they stay on the Azumabito ship. The two teams left the harbor as Hange took out several Wall Titans before ultimately dying.