Demon invasion.

I've made some progress. The hero is... I don't understand the idea of starting with 7th-level creatures, especially those that can reach you in one turn. Also, it's no secret that in this case, everything will depend on how quickly you upgrade your magic and spellcasting (depending on what else you get) – what's the point of having creatures that are poorly or almost not vulnerable to magic, even if it's random? Does that mean you have to sit and click, waiting for a suitable option to appear?
I encountered one of these options. I defeated the enhanced druids; even the dog managed with the griffons. But how do you defeat many enhanced dragons, or hundreds of succubi, or viziers of genies? There's no meat, and there's barely enough magic.
Moreover, the viziers were guarding an artifact from the set, which could have been very useful.
Also, why can't you prevent neutral creatures that are immune to the "Wave" spell, in addition to those that are invulnerable to magic?
There are many questions.
And it all depends on how close you are and the starting conditions.