Eren Jaeger has attained his final form in Attack on Titan, but what secrets lie beneath that gargantuan mass of bones and evil intent? Since Attack on Titan season 4 began, Eren has devolved from classic Shonen-style protagonist into a murderous devil corrupted by the same cycle Marley and Eldia have been repeating for centuries. Believing the only way to protect his friends is by annihilating everyone else, Eren resolves to unlock the Founding Titan's godlike power. Though seemingly foiled by his older brother, Zeke, Eren wins out in Attack on Titan episode 80, «From You, 2000 Years Ago,» and transforms into the Founding Titan proper.
In a dramatic final sequence, Attack on Titan shows Eren Titanizing one last time, marked by the same bigger-than-usual surge of lightning and energy that announced Ymir's transformation 2000 years prior. His decapitated head jolts back to life, then promptly begins growing into a massive, sprawling skeleton multiple times larger than even the massive Titans housed within Paradis Island's three walls. Attack on Titan refrains from showing Eren's full body in episode 80, but this is clearly a transformation unlike anything seen before. How did Eren transform, what powers does he now command, and why does he look like that?
Related: Attack On Titan Removes A Detail From A Key Season 1 Scene
As Zeke found out while waiting for Eren to awaken in the Paths, the Founding Titan power is nothing more than Ymir responding to requests — a limitless young girl pulling the strings of her bloodline. This meant Zeke could talk Ymir into dropping the vow of renouncement imposed upon the royal family by King Karl Fritz 100 years before Attack on Titan began. But Ymir's humanity goes both ways, and Eren
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