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The Radagon's Scarseal is one of the Talisman items in Elden Ring that can increase attributes when worn.
The Radagon's Scarseal can be obtained by defeating the Ancient Hero of Zamor found in the Weeping Evergaol, located in the north-central area of the Weeping Peninsula Region.
The Radagon's Scarseal raises Vigor, Endurance, Strength, and Dexterity by 3, however it also increases your damage taken by 10%.