Lord krishna had a wonderful conch

Answer: 1
Conch of Lord Krishna was called Panchajanya. Shri Krishna used to announce the end of the battle for the day in great Mahabharata battle using Panchajanya.

After completing their study, Krishna and Balaram want to give guru dakshina to guru Sandipani. Sandipani already knew the power of both so he asked for his son who was drowned in the sea. To fulfill this, Krishna went into the sea where he killed demon Panchjanya and got the conch. He then named the conch shell after the Demon. Whenever Krishna blows from the shell it foreshadows the death of his next opponent.