I've seen and battled the Death Omen twice, once behind Kingshead quite a way to the edge of the map, the other pretty much directly behind Padres along with the little clump of phantom ships i usually find behind there. I remember the one behind Kingshead because it shot fury at me but when it was sinking, and somehow the fury would be constantly floating in the water. I changed server and came back a little later and it was still there