You'd Summon a Person with the name "Let Me Solo Her" to help assist you in defeating Malenia, as She Gets Summoned, she is Naked except for the Jar Head that serves as her "Helmet". you notice she has 2 Katanas which is The Rivers of Blood Katana, and the Uchigatana which is +25 with Hoarfrost Ashes of War in her right hand.

Let Me Solo Her: "Need a Helping hand to fight Malenia huh? Sure."