These Legendary Marks of Odin also known as Odin Marks can be collected from doing Legendary Quests than can be use to craft Legendary Blessings or purchase Legendary Items. In addition Marks of Odin can be received from Shared Terminal Chests acquired from completing the daily shared missions.
A player can see how many they've accumulated by pressing C, or I, to bring up the character sheet and it is displayed on the bottom left of the sheet.
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