Five most powerful Weapons of Krishna in no particular order are:
1.Sharanga Bow
Sharanga bow was created by divine architect Vishwakarma for Lord Vishnu. It was used by Krishna in many of his wars.
2. Sudarshan Chakra
Lord Agni gave Sudarshan Chakra to Krishna during Khandava daha . He used it to kill Sishupala.
3. Kaumudaki Mace
Early scriptures showed Lord Vishnu holding Kaumudaki mace in his right hand.
4. Panchajanya
Sage Sandipani was the gurukul teacher of Krishna,Balarama and Sudhama. The sage’s son was kidnapped by a sea demon named Panchajanya or Shankasur who imprisoned the child in a conch shell. As part of guru dakshina, Krishna killed the sea demon and returned the child back to his parents. Sandipani presented the conch to Krishna and named it Panchajanya.
5. Nandaka sword
Lord Vishnu is called as Nandaki in Vishnu Sahastranama. It means one who wields Nandaka. It is also mentioned in Vishnu Purana and Varaha Purana.
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References:
- Vishnu Purana
- Varaha Purana
- Vishnu Sahastranama
- Mahabharata