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In my opinion, these creatures need to be balanced:
Simurghs and Simargls (to be honest, I often confuse them).
Their resistance to earth and regeneration are good, but their stats are weaker compared to immunity to magic and blessing. I would rename Simargls to "Birds of Fortune," equalize their stats, and give them the Wheel of Fortune.
Soulless and Obsidian Goliaths.
A large shield and 50 HP are less effective than Unexpected Storm, Storm Strike, and 25% magic resistance (the difference in defense). I would give Soulless creatures a cleaving sword and increase their attack by ten (this would suit their swords).
Ice and Mist Elementals.
Ice Elementals are very strong with their spells. In the third week, I simply took them, along with Fire and Gas Elementals, and tried to defeat everyone using Rings of Cold. Ice Elementals need their spell level reduced, while Mist Elementals need their speed increased, given the ability to protect allies, and a large shield.
Added after 3 hours and 47 minutes
Gas and Lightning Elementals.
The upgraded archers are not very effective; the situation is similar to that of the Skeleton Warriors. I suggest slightly increasing their damage and giving them one lightning bolt.