Arthas' Scourge was a group of Undead under the personal command of the Death Knight Arthas Menethil.
Many months after the Burning Legion's defeat at Mount Hyjal, King Arthas Menethil had returned to Lordaeron to purge the remnants of the Humans who lived there. Arthas led his own force of Abominations and Ghouls in the southwest to prevent the humans from escaping. He later led his force to assist in destroying the villages and slew the Paladin, Halahk the Lifebringer.
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The name only appears in the World Editor.