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NECROMANCER - in this section, at the bottom, in the "Videos" topic, on the first 2 pages, it is described in great detail...
Erythrocytosis - oh, that's not easy, is it. Or rather, it's simple, but you need to remember...
So, you place a box, assign a player to it, and then specify this box as the main hero in the "map properties"... If it doesn't work, I'll take another look...
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besides, you need a random hero. Otherwise, it will be any hero, but you can choose...
although, it seems that this can also be configured, just like, for example, the choice of a starting bonus - a non-changeable random...
I did it with the box, I even reserved heroes, but it still crashes.