Heroist
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It is possible if you talk to Tas'netil, a secondary hero, and then start the ritual with Vol'diel on the same day. We probably need to remove the possibility of exploiting this. And regarding the boss – the hero was supposed to defeat him alone. For this, a bonus to spellcasting is given, and the boss has a lot of health and high defense. But different approaches are acceptable, of course :).
And why is he a secondary hero? I can reach him with my main hero in 2 turns; he won't have time to regenerate. Or is there a daily script involved?
Whatever