The purest light can destroy anything tainted by darkness.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Spell Level 5Casting Value: 10+
Banishment is a magic missile with a range of 24" – the target suffers 2D6 hits. Against models with the Daemonic, Undead or Vampiric special rules, this is increased to 3D6 Hits. The Strength of the hits is equal to 4 plus the number of Wizards that know spells from the Lore of Light within 12" of the caster (not counting the caster themself). Successful Ward Saves taken against Banishment must be re-rolled. The Wizard can choose to extend the range of this spell to 48". If they do so, the casting value is increased to 12+.