Take No Prisoners!

Kill the cultists and the summoned demon near the White Fortress and return to Alonso de Desirae.

I think I saw a hooded person next to the demon, and I'm pretty sure it was a cultist! There where cultists show up, expect trouble. Kill them before it happens!

If you see a cultist, kill them at the spot!

So the cultists were summoning demons? I must report to Izbor on that. We need a squad of Demon Hunters to keep this situation under control.