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To Ta Kotoraya:
Okay, I'll adjust it - a horde of liches and other powerful creatures can appear right away, starting from the first week, guarding an artifact or a dwelling (which is even more relevant). The task of early clearing without losses is a priority, for obvious reasons. Creatures of the lich level can guard a mage tower or a naga dwelling. Wouldn't you want such a challenge on week 3 instead of week 5? I don't think so.
I just noticed that some people get scared by strong defenses, when it's possible to solve everything quite easily by using your strengths.
But I'm not the one to talk about the Tower... I usually play as elves...