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Do you even read what I write? Read my post carefully:
Solo means alone, that is, without joining anyone at all. I can't think of any alternative interpretation of my phrase, so I'm afraid it's just careless reading. Not everyone levels up either, using horseshoes to increase skills, because leveling up takes too much time. Yes, playing through the game solo with a level 1 character is a pain, but it's worth it.
Added 6 minutes later
Can you give me a couple of links to speedruns of the 7th game? Maybe I'll finally find out why Judge Kondraty gets so upset. And it would be interesting to read how a team of levels 10-12 finished the game.
Judge Kondraty gets upset exactly 4 months after completing the quest to repair the castle.
A team of low levels can easily handle it; they just need a few things for a comfortable life - healing, invisibility, and transport spells.
Personally, I played as the light side, and there are elementals there that can either destroy monsters or simply distract them so that the party can sneak through where they need to. And the quests on the light side are easier.
I think the only really difficult place was the quest to kill Xenofex, it's really tough - there are a lot of demons in the hall, and it's impossible to kill them all. I had to improvise - lure Xenofex out of the hall, which I managed to do after N attempts.