Spear Luin

In Irish mythology, the Spear Luin (originally Luisne, meaning flaming or glaring) is one of the Four Treasures of Ireland. It is also known as the Gae Bolg, under which name Cuchullain was supposed to have used it briefly.

The Spear Luin was originally forged by the god Lugh for use against Balor of the Evil Eye. Its element was that of fire; it was said to be so intensely hot that it had to be kept point-down in a large barrel of water so as not to burn down the place in which it was held. The spear supposedly never missed its target, infallibly destroyed its target, and always returned to the thrower's hand.