Why was the final battle in Attack on Titan called the Battle of Heaven and Earth?

Erwin Smith: Impactful Moments in Attack on Titan

Rumbling historical footage of Attack on Titan-part 1 #aotedit

Levi Attack on Titan Revolution Game: AoT Roblox

AOT Revolution How To MOVE Like LEVI! (Movement Guide!)

I Became Levi Ackerman In Untitled Attack On Titan Roblox...

Understanding Eren's Impact in Attack on Titan

Since That Day - attack on titan | eren yeager | aot edit | eren edit | attack on titan edit #aot