Does absolute morality require a supernatural explanation?

[KungKras]

Absolute morality does require some outside observer that sets the "standard" for what is moral and not in every morally ambiguous situation.

I don't want want an absolute morality. I'd much rather have a well thought out consensus for what is to be considered moral in a society, and I'd want morality defined as "actions and attitudes that leads to the highest possible well-being for the largest number of people possible"