[Knai]

That depends. I was in a SP test game when my god was heavily horror marked, summoned him back, and just killed the horror. Admittedly I had Gift Of Health up, had boosted it significantly, and was throwing around a Wyrm in the first place, but if you can take down the Doom Horror then you win. And that guy took down a whole bunch once I finally got him built up completely with the items I wanted and started wishing for Doom Horrors for kicks and giggles against the AI. But if you can't beat any of the Doom Horrors, you have a dead pretender.