Casket of Ancient Winters

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The Casket of Ancient Winters is a powerful magic item in the Marvel Universe.

It is an Asgardian relic, which, when opened, can reproduce the infinite icy cold of Niflheim, one of the Asgardian Nine Worlds. It was the greatest weapon of Malekith the Accursed. It was used by the fire demon Surtur to cause chaos on Earth; this would help facilitate Surtur's invasion plans.

It causes snow-related weather across the planet for a time, until Thor and his allies neutralize the threat.

It was entrusted to the care of the Avengers butler, Edwin Jarvis by the god of Thunder Thor.

This object also greatly affected the X-Man Iceman for a time, affecting how he controls his powers.

An alternate universe version also affected the Iceman of the Mutant X universe, but this time, permanently. This Iceman could not touch another entity without freezing them instantly.

In the intercompany crossover, JLA/Avengers, the casket was one of six items of immense power representing the Marvel Universe.