User blog comment:A.J AL/Where does Death fit in?/@comment-34326521-20160527075523/@comment-1975828-20160527112736

In terms of power level, Death is above all of God's creations, if we consider Michael as the oldest, since it is canon that Death is more powerful than Michael. I heavily doubt God created the concept of death itself, or the personification that we meet, since clearly, God himself can die, and it is apparently the task of a reaper, or the Head of Reapers, aka Death, to reap him.

I don't think Death needs to meet Amara to know her. He can be an observer and know things. He existed durng the war, and there's nothing to say he didn't see what went down. For Amara to not know him shouldn't be a surprise, when there are still so many things Amara doesn't know. She was "tricked" and then imprisonment, remember? If she was omniscient, then I doubt tricking her would be possible.