3D Anime, Eren Yeager, the conflicted protagonist of Attack on Titan, undergoes the horrifying transformation into the colossal Founding Titan. Render in a detailed style, capturing the immense size and grotesque features of the Assault Titan. Eren's human body shrinks within the Titan's nape, his face contorted in a mixture of pain and determination. Utilize dark lighting and a muted color palette to emphasize the horror and power of the transformation.