Demons are types of units with a number of properties. They require undead leadership, but are not subject to the Banishment line of holy spells. They are also unaffected by a number of other undead-only counters, such as Dust to Dust and Wither Bones. Instead, they have some of their own counters.

Non-national spells which counter demons are:

• Smite Demon (Divine, 2, hits one demon, Magic Resistance negates)
• Banish Demon (Blood 2, 1, instakills one demon, Magic Resistance negates)
• Cleansing Water (Evocation 6, 2, irresistible AOE damage, also works on undead)
• Demon Cleansing (Enchantment 9, 5, 1, doubles other damage on all demons)

A number of items also have significant bonuses versus demons. These include:

• Holy Scourge (x3 DMG, Undead too)
• Just Man's Cross (x3 DMG, Undead too)
• Flambeau (x3 DMG, Undead too)
• Herald Lance (x3 DMG, Undead too)
• Demon Bane (x2 DMG)
• Bell of Cleansing (nukes Demons and Undead near the holder)