Suggestion for a new faction.

I don't know about you, but I see a balance issue here. Before the final battle, you can spend a whole week preparing, which would be quite frustrating for the enemy. Also, it wouldn't be fair if every time, the week featured creatures from that faction. And most importantly, what happens if astrologer heroes cross paths? And the percentages, in my opinion, are very high. In the astrologer's tower, it's very expensive to change the week, and the selection is, to put it mildly, not very good. Here, if such a hero appears in the tavern, you can change the week to suit your needs with a 50% chance for 2500 gold. I don't think the astrology idea is very good. It's better to come up with something else... Even if you reduce the percentages, it will be overpowered, and if you make them very small, it won't be worth it.