Material: Metal Body, not sure about the Divine one
Primary Use: Defence
Effectiveness: Could defat a great Asura
First Used: Rigveda times
Still in Use?: Yes in rituals though, both in Bharat (India) & Japan
Presiding Deity: Indra
This is a weapon that has left all of us puzzled, but it's said to symbolise both the properties of a diamond (indestructibility) and a thunderbolt (irresistible force). It's a type of club with a ribbed spherical head and can come in a variety of styles, including one with sharp points on the end. Said to be used by Goddess of Rain and Thunder, Indra and said to be one of the most powerful weapons in the Universe. It is now still used, but only in Hindu rituals.
The earliest mention of a Vajra is in the Rigveda, made by Tvastar the divine weapon maker, for Indra. The Vajra can still be seen as an emblem, this time as a viśvavajra or double vajra in Bhutan and as a Privy seal for the King of Thailand. Puranas that came later than the Rigveda mention the Vajra in the additional story of Sage Dadhichi, who was said to have made the weapon from his own bones. This was so Goddess Indra could defeat Asura, Vritra, who apparently couldn't be killed by any weapon made up until that time. The Vajra also has made it's way to as far as Japan with Buddhist rituals, still used to this very day.