Then there is no weapon suited to Krishna's prowess. He requires weapon like the one with which Mahadeva (Shiva) kills Nagas and Pishachas in the battle.
तथा कृष्णस्य वीर्येण नायुधं विद्यते समम्। येन नागान् पिशाचांश्च निहन्यान्माधवो रणे॥