The Shadow Demons

The Shadow Demons were the servants of the Anti-Monitor who created them from the ranks of his most evil Thunderers. As the Anti-Monitor started consuming the Multiverse, his Shadow Demons were dispatched across it to watch the actions of his positive-matter counterpart. Some of these witnessed Harbinger traveling across the universes to recruit heroes and had divided her essence into duplicates that went about this task. One of these duplicates was ambushed by a Shadow Demon that took over her form. Afterwards, Shadow Demons struck at the Monitor's satellite where a gathering of champions had been chosen to help protect the Multiverse. Despite their powers, they were unable to stop the relentless onslaught of the Shadow Demons until the Monitor intervened whose light drove them away from the satellite. (Crisis on Infinite Earths v1 #1) The Shadow Demons were later shown to had fallen under the service of Darkseid. (Death of the New Gods v1 #2)