Yesterday, I started playing this mission. As always, I decided to max out Rai'lag and eliminate everyone in my path. I reached the first town with almost no losses. Only Daleb killed two black dragons with her own hands at the very beginning. I went there without looking, not caring who lived there. And there was something to see – 60 archdevils and a huge number of imps, which quickly drained all 330 mana units Rai'lag had...

Well, nothing. You get two for every one you kill. I don't know how many they'll give me when I complete this mission. I won't go to that town again.