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Regarding the treasure chamber, it has a significant advantage, especially with at least 3 Ramparts! Plus, along with the warehouse and fountain (or whatever it's called), it somewhat compensates for the expensive construction cost. Dwarfs and Dryads are excellent tanks! (and the latter are also very good in attack). There are few archers, but that's why they have a double shot! They work well with level 3 ranged attack + the "Accuracy" spell. Centaurs are very good. Pegasi are difficult to use, and increasing the mana cost hardly seems worthwhile against a Warrior (since Mages usually have enough mana anyway). Their use as a flanking strike force ("feigned attack") turned out to be interesting; fortunately, their speed allows you to initiate this risky maneuver almost unnoticed (although their high initiative might give you away).
Unicorns are excellent troops, but they are difficult to accumulate. It generally takes 2-3 weeks to build Dragons and gather enough population (in my opinion, it's not worth sacrificing other troops for this).
Overall, the army's advantages include magic resistance and the Unicorn's aura... but again, this is against a Mage! Against a Warrior, the Unicorns' blindness is very useful. And I usually don't upgrade Dwarfs (20% instead of 40% resistance, and lower speed, so it's not worth it).
If you neutralize the archers immediately and retreat, removing the weak Pegasi, you only have to deal with Unicorns and Centaurs, and shoot at Dwarfs and Dryads whenever possible, using slowing effects, but not on everyone (the greater the gap between Centaurs/Unicorns and Dwarfs/Dryads, the better - otherwise, they will all attack at once, and that's not good).
The "Earth" spell is very satisfying for the Rampart's magic. It provides general slowing! Half of the troops won't reach their target with a defensive tactic and the number of archers. At the same time, you need to watch who to shoot at... it might turn out to be more effective to harass the player's reserves (slow units) than to shoot at the front line, which Dwarfs and Dryads handle well, protecting the Elf. In the middle of the battle, it's good to break through with Pegasi to the enemy archers (or Centaurs + speed boost).
I think this city is very balanced and very strong! Although it's not my favorite (neither in terms of atmosphere nor in terms of cold calculation)