Winter descends on the northern frontier. Lu Sen, a lumberjack, has spent five years felling trees. With every tree that falls, the Demon King’s seal loosens by an inch. A woman in black robes walks across the ice, and a rusted iron sword rings with blue light from a crack in the stone. He sets out along the frozen river, dripping his blood into the seven nodes of the formation. To protect the last pocket of peace, he forges himself, inch by inch, into a sword sheath. When the snow falls, there is only one way: forward.