The Exterminator Prototype is an item from the Better Dungeons mod with the appearance of an iron ingot, possibly only able to be obtained through creative/cheat mode.

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The Exterminator prototype

However, when right clicked, this item spawns a Wyvern, a strange mob with the appearance of a dragon's head. Once spawned they will fly in strange patterns, they occasionally do 2 damage to other entities (including other wyverns) and players.

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A Wyvern

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