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Based on everything mentioned above, my conclusion is as follows: The Swamp Castle is strong on S maps, and possibly on M maps, but it is unlikely to be able to compete with other castles on XL maps. The strength of the Fortress lies in its rapid development in the early stages, but then it falters because the others catch up. The creatures do not stand out with any particular strength (I have written this somewhere before, but I will repeat it):
Gnoll – a relatively decent unit for the first level, but it does not reach the level of Centaur, Halberdier, and Skeleton (all, of course, upgraded).
Lizard – it is difficult to call it a ranged unit. As a unit with ranged attacks, it is not very good... Also, it is the only one of its kind in this castle, which greatly complicates the situation.
Dragonfly – good speed, health below average. Also, average attack, defense, and damage. The only thing is its speed, dispel, and weakness (although reducing the attack by 3 is not so significant, but for a normal hero). Usually, Dragonflies do not survive even 2-3 rounds (in battle).
Basilisk – Attack, defense, damage, health, petrification – everything is okay, but the speed is low. By the time it reaches, the Dragonflies and Wyverns will already be gone. But overall, it is a decent unit.
Gorgon – the leader in health and defense at its level. BUT, the attack, damage, and especially the speed greatly reduce its combat effectiveness. Deadly gaze is, of course, very good, as it usually deals more damage to creatures of level 7 and higher than its normal attack. But if you don't let it get close to creatures of levels 6-7 (which is quite possible, thanks to its speed), it will lose all its usefulness.
Wyvern – well, this is the weakest creature of the 6th level. Attack, defense, damage, and especially its 70 health are something else. Cyclops, although a ranged unit, is stronger. Poison will be more or less useful if the Wyvern manages to apply it. Here, as in the case of the Dragonfly, it rarely survives to the 3rd round. 15 Death Knights will usually defeat 20 Wyverns. The conclusion is obvious here...
Hydra – everything is average, except for speed. Attacking everyone around is very useful, but due to the aforementioned speed, like the Basilisk, it will not reach the enemy immediately.
As for storming cities with the Swamp Castle, things are (in my opinion) not very good. Dragonflies and Wyverns will fly over the city walls and immediately fall there, and they will be lucky if they manage to apply weakness or poison to someone. The Gnoll, Gorgon, Basilisk, and Hydra will have to walk to the walls and wait for holes to appear. Since the heroes of the Fortress usually turn out to be poor mages, you cannot usually rely on an earthquake. If the hero has the Artillery skill, then I think it will not be difficult to destroy the catapult. Next, the main thing is to plug the breached walls with some unit with a decent amount of health and shoot down the unfortunate swamp creatures with archers and magic.
That's how it is... BUT, this is just my opinion. I think I have said everything I wanted to. :)
