The sword of the Elven King Fingolfin.

This sword was said to glimmer like ice, thus the name. When Fingolfin battled Morgoth after the Dagor Bragollach, this sword was used to wound Morgoth seven times.

As Fingolfin fell, he used his last stroke to hew Morgoth's foot with Ringil.
Encyclopedia entry originally written by KingdomWarrior