Demonic Tremor (lore)
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From Diablo Wiki
One usually hears Demonic Tremors before seeing them. These behemoths move slowly and heavily, pounding the earth with their massive fists. Many a siege has been broken by the tremors' battering strikes, and many more enemies of the demons have been felled by their wrath. I pray that our world will never see them again. -- Deckard Cain