Thor's Ire is a ring blessed by Thor, the spirit of Thunder. It can be used by either Nils or Ninian in Fire Emblem: Rekka no Ken in order to use a dance or play a song that increases another character's critical hit percentage for a turn. It is hidden in a chest in chapter 26xE/28xH: Night of Farewells.
It should also be noted, it's Japanese name "Thor's Anger" is most likely a referrance to the crusader Tordo's holy weapon Thor Hammer from Geneology of the Holy War on the Super Famicom.
Consumable Items
Equipment
Miscellaneous
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Item lists
Shadow Dragon and the Blade of Light - Gaiden - Mystery of the Emblem - Genealogy of the Holy War - Thracia 776 - TearRing Saga - The Binding Blade - The Blazing Blade - The Sacred Stones - Path of Radiance - Radiant Dawn - Shadow Dragon - New Mystery of the Emblem - Awakening - Fates - Heroes - Echoes: Shadows of Valentia - Three Houses - Engage