Devil of All Earth

The Daichi no Akuma (大地の悪魔) was a figure of Eldian mythology who made a deal with Ymir Fritz, causing her to become the first of all Titans.

Appearance
In all illustrations depicting the Devil, he is shown as a large, crouching figure with a menacing smile. In the book Frieda Reiss reads to Historia, the Devil is covered in a large cloak and hood, whereas in the book Mr. Yeager reads to Grisha, his head is exposed, revealing two goat-like horns and a long tail.