If you're running low on effigies you could try using the rings that let you keep your souls when you die, it also allows you to keep your humanity. And those two NPCs are just about entirely worthless, see if you can summon a couple of real people to help as that will probably work much better, even if the person you summon is terrible.
Not to turn you away from it but the 2nd DLC's bosses are even harder, imo.
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