Casket of Ancient Winters

The Casket of Ancient Winters is a Frost Giant weapon used to freeze their enemies.

Thor
In 970 A.D., Laufey used the power of the Casket to enslave Earth, but he was defeated in battle by Odin, and the relic was taken by the Asgardians and brought to Asgard, where it was kept in Odin's weaponry along many other powerful relics.

In the late 2000's, some Frost Giants, with the aid of Loki, tried to steal the Casket, but they were vaporized by The Destroyer. When Loki discovers his origins as Laufey's son, he takes the Casket for himself; once gained the throne of Asgard, he uses the power of the Casket to freeze Heimdall, who was opposing him as a ruler. When Loki was banished and Odin sat once again on Asgard's throne, the Casket was returned to his place in the weaponry.

Powers and Abilities
When opened, it can reproduce the infinite icy cold of Niflheim. Due to his magic, it can only be held by a Frost Giant, and it burns whoever else touches it. It can freeze anything.