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The Ash of War - Poisonous Mist is one of the many equippable Ash of War Weapon Skills found throughout Elden Ring, and one that you can equip to your weapon to give it new weapon skills and scaling effect.
The Ash of War - Poisonous Mist is equippable on melee weapons excluding whips, fists and claws, and grants the Poisonous Mist Skill to use.