Definitely either Proud Soul Millionaire or S Ranks on Human. Once you get the Bloody Palace down it isn't really that hard. If you think it is, imagine completing it three times to max out your Proud Souls.
Avatar courtesy of Spazaz Man, GSL Signature courtesy of Noid
"Come on, get up. You can do better than that."
Think you have what it takes to join my club? Prepare to wade through an ocean of blood