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I was being dumb and I killed the hunter of hunters to get the Blade of Mercy early. I realized I **** up after reading this. I guess I will have to wait for NG+2 In order to kill him.
It's just NG+.
You can actually summon Alfred in Central Yharnam, after you kill the blood-starved beast. It's a pain to get him to the tomb of Oedon, but it makes the fight much easier.