@MMX I think Cerberus is most definitely appropriate at rank eight, as its “strength” can be based off the number of the zombies required to satisfy the challenge. However I don’t agree that Polter-witch-ghost-mansion-lady (kidding) is on the same level as George Romero. Yes, she duplicates herself; but so do the hellhounds (not quite to the same degree, but you get where I’m going). I think she would be a better fit in rank four. Also to your point on The Giants, how do they differ from Cerberus at all? If you don’t intend on obtaining the Hell’s Retriever then they are nothing more than a head on a well. I would just like to know your reasoning, as you typically have an answer.
The only other issue I have is with ranking them by difficulty. What happens when new adversaries are introduced in the next installment? Or are will this be finalized and never updated again?