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If truly useless monsters don't exist, but rather there are just poor tactics, then I'm simply not good at playing with:
- Wolves (Nature), despite the fact that they attack twice, their speed is very low, and their mortality rate is high. Fairies look much more preferable due to their retaliation ability. I try not to buy them at all. I don't want to waste money.
- Ballistas (Humans). They are so slow that they cause more harm than good; I don't see any point in buying them, except for defending a castle. For me, an army must be mobile.
- Orcs. They are expensive, slow, and ultimately ineffective. Especially when there's such an alternative in the form of Cyclops.
Maybe I'm a bad tactician, maybe I'm greedy and stingy, but these units are a rare sight in my army.