It is the knife whose cut restores. 

Wolfsangel_(Wolfsjagd)

Nonnos, Dionysiaka 6. 155 ff
Zagreus the horned baby, who by himself climbed upon the heavenly throne of Zeus and brandished lightning in his little hand, and newly born, lifted and carried thunderbolts in his tender fingers for Zeus meant him to be king of the universe. But he did not hold the throne of Zeus for long. By the fierce resentment of implacable Hera, the Titanes cunningly smeared their round faces with disguising chalk (titanos), and while he contemplated his changeling countenance reflected in a mirror they destroyed him with an infernal knife. There where his limbs had been cut piecemeal by the Titan steel, the end of his life was the beginning of a new life as Dionysos. He appeared in another shape, and changed into many forms: now young like crafty Kronides shaking the aegis-cape, now as ancient Kronos heavy-kneed, pouring rain. Sometimes he was a curiously formed baby, sometimes like a mad youth with the flower of the first down marking his rounded chin with black. Again, a mimic lion he uttered a horrible roar in furious rage from a wild snarling throat, as he lifted a neck shadowed by a thick mane, marking his body on both sides with the self-striking whip of a tail which flickered about over his hairy back. Next, he left the shape of a lion’s looks and let out a ringing neigh, now like an unbroken horse that lifts his neck on high to shake out the imperious tooth of the bit, and rubbing, whitened his cheek with hoary foam. Sometimes he poured out a whistling hiss from his mouth, a curling horned serpent covered with scales, darting out his tongue from his gaping throat, and leaping upon the grim head of some Titan encircled his neck in snaky spiral coils. Then he left the shape of the restless crawler and became a tiger with gay stripes on his body; or again like a bull emitting a counterfeit roar from his mouth he butted the Titanes with sharp horn. So he fought for his life, until Hera with jealous throat bellowed harshly through the air–that heavy-resentful step-mother! And the gates of Olympos rattled in echo to her jealous throat from high heaven. Then the bold bull collapsed: the murderers each eager for his turn with the knife chopt piecemeal the bull-shaped Dionysos.