Катангенс
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Yeah, I'm a bit shocked myself. Having mass slow and scatter on the starting turn is overpowered, but there won't be enough mana for everything.
Anyway, I've completed about 50% of this scenario.
Added 3 minutes later
Even a demon ran away from me, swam halfway across the map, and on the second turn decided it didn't want to land and decided to continue on its way towards the Orcs.