The earth god was the (devil)'s fruit and posseses imu, the hellfire serpent.

THE EARTH GOD IS THE (DEVIL)'S FRUIT AND IT POSSESSES IMU.... THE HELLFIRE serpent.

Speculation!!!!! imu has horns in hybrid form and not in base form. Imu's tail is still black not colored like his body. Implying he himself is possessed. That devil tail indicates the fruit, not imu. Imu is The hellfire serpent. Which raged with the earth god in the first world. The devil's fruit devil.