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Well, firstly, I wouldn't be so sure that the Swamp has low speed. They aren't slower than, say, the Rampart or the Necropolis – two units that can reach the enemy from the very first turn – that's a strength.
The low HP is easily compensated for by excellent defense. Unfortunately, I don't know the calculation formula, but based on my experience, I can say that an extra +10 to the defense stat is a worthy compensation for the missing HP.
In my opinion, you can't just sit in defense with the Swamp; you need to attack, and with everyone, because there isn't a single truly slow unit. And even better, the hero should have either Air or Water expertise – for mass fast or mass prayer.
And secondly, a huge plus is the location – usually in a swamp. This greatly simplifies the task of defending the castle. A normal enemy will be the last to venture into a swamp, because if they enter without pathfinding and logistics, it will take weeks, or even months!!!
The low HP is easily compensated for by excellent defense. Unfortunately, I don't know the calculation formula, but based on my experience, I can say that an extra +10 to the defense stat is a worthy compensation for the missing HP.
In my opinion, you can't just sit in defense with the Swamp; you need to attack, and with everyone, because there isn't a single truly slow unit. And even better, the hero should have either Air or Water expertise – for mass fast or mass prayer.
And secondly, a huge plus is the location – usually in a swamp. This greatly simplifies the task of defending the castle. A normal enemy will be the last to venture into a swamp, because if they enter without pathfinding and logistics, it will take weeks, or even months!!!