Sing, Behemoth, Sing

Attack on Titan meets Deadwood.

In a desolate future where the monstrous giants known as Angels stalk the earth, Mudd and Arnold walk in the shadow of Marmaroth. Far from civilization, they've fought their entire life to survive in the hazardous wilds. But unlike the Loveless-mindless thralls who feed on the excretions of the Angels-at least they've retained their humanity, even as they sing Marmaroth's song from afar.

Until a murderous Angel comes with his spears of light, intent on murdering his own kind: and the earth trembles as giants clash. A friend Mudd thought he knew consumes the heart of an Angel-and ceases to be human.