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This article or section contains lore taken from Warcraft III: Reign of Chaos, Warcraft III: The Frozen Throne, the manuals, and official bonus maps.

• Scepter of Mastery
• Transfers control of the targeted non-Hero unit to the player who uses the Scepter. The transfer of control is permanent.
  Cannot be used on Heroes or on creeps higher than level 5.
• 3 Charges
• "Allows mind control over non-Hero units."
• Sell Price: 500

Transfers control of the targeted non-Hero unit to the player who uses the Scepter. The transfer of control is permanent.
Cannot be used on Heroes or on creeps higher than level 5.

Source

Arthas can find one in Under the Burning Sky, chapter 8 of the Warcraft III undead campaign, Path of the Damned.