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From Terraria Wiki
The Obsidian Shield is an accessory made from the Cobalt Shield and Obsidian Skull, and combines their functionality as well as their defense. It grants immunity from knockback, as well as immunity from the Burning debuff, and provides 2 defense.
- It is extremely useful when traversing The Underworld, as knockback and damage from Hellstone are two of the major threats the player will have to deal with.