Chandrahas
In the Hindu epic Ramayana, the Chandrahasa sword is an indestructible sword that Lord Shiva gifts Ravana.
It is believed that Ravana went traveling in his chariot, he came across Mount Kailash. He became furious as his chariot could not cross over this mountain, so in a state of fury, he ordered the mountain to give way to him. The mountain refused as it was the residing place of Lord Shiva and Goddess Parvati. Ravana stepped down the chariot and lifted the mountain to remove it from his path but he found he could not lift it. Lord Shiva had placed his toe on the mountain and explained how Shiva carried the moon on his head, so how could Ravana ever hope to move him when he could not move his toe. This caused Ravana's little finger to crush under the mountain. Ravana realized his mistake and to impress Lord Shiva sang the Shiva Tandava Stotram for the first time. Lord Shiva, impressed by his offering, gifted him the Chandrahasa sword which is indestructible.
