Cold Ash of War Useable on all melee armaments (whips, fists, and claws excepted) Coat armament in frost, and then slash, spreading frigid mist forwards. The armament retains its frost for a while.” ...

The Ash of War: Poisonous Mist is a drop from a Teardrop Scarab that appears deep inside the Swamp of Aeonia in Caelid. You must first locate the Aeonia Swamp Shore Site of Grace to find it.