Yeah, the Prophet was steamrolling through the LoSH, yet was utterly terrified of Omen.
As for Omen himself: he seemed to be a psionic entity. Saturn Girl(a universal telepath) couldn't even read his mind, and on more than one occasion he owned the LoSH with a gesture. He also tooled the Prophet, obviously.
^ that sentence came out wrong, what i meant to say is:
Just because he absorbed Prophet's essence doesn't mean he was that beyond him (prophet, i mean) because we see Prophet getting hurt in the issue prior to that:
http://i.imgur.com/B0pEVve.jpg
http://i.imgur.com/zeZYCI7.jpg
Prophet was also attacked even before that so.....didn't require much from that point....
Also, just want to post this regarding Omen's powers (bio):