Valley of the Marauders

And what does "boss" mean to you?

A boss, in my understanding, is a creature that significantly surpasses ordinary mercenaries (for example, archangels) or neutral creatures (phoenixes) in terms of parameters and abilities.

I don't understand. Did the final heroes not appear, or were they so weak that the fight with them was unnoticeable?

After completing all five valleys, I go to the God of Thunder, defeat the three hero guards, and approach him. A dialogue occurs without a battle with my (direct) participation. He simply displays a victory message for a fraction of a second. There is no battle with the succubus, angel, or God. All three heroes are in place, but they don't want to fight.
P.S. I don't remember their strength because I only fought them in version 1.0.