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.

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

Patch changes


Cetro de Dominio