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Demons are types of units which a number of properties. They require undead leadership, and are subject to the Banishment line of holy spells. They are however not affected by a number of major undead only counters, such as Dust to Dust or Wither Bones. Instead, they have some of their own counters.
Non-national spells which counter demons (and often also undead) are:
A number of items also have significant bonuses versus demons. These include: