Blue crystal

13ga, thank you for your feedback. Here are a few clarifications: Active enemies choose skills at will during leveling up. I don't know exactly which schools of magic were chosen; checking this would be tedious, so for each race, a specific set of spells is given, characteristic of the leading schools. The level of spells depends on the week number. The stats of enemies initially exceed the player's stats by 2 units each. This is quickly compensated for by the hero's special abilities and stat boosts. Then, artifacts make the difference (their level also depends on the week number). Stats are distributed randomly when enemies level up.

Added 2 minutes ago
The quests are intricate, but I disagree that they lack logic. The only truly difficult one to figure out is crossing the chasm. The Guardians were significantly nerfed in the 05.01 version.