Auto-translated
I'll take Alkin for the Swamp. Or Bron for the Basilisks. The goal is to build Wyverns as quickly as possible. The Swamp's advantage is its territory. If an enemy attacks, they'll have a hard time reaching the Castle. In my opinion, the Swamp is the best Castle for a defensive strategy. Excellent defense upgrades make many units durable. As for playing against the AI, it's a good Castle with low-cost buildings. It also has its advantages when playing against a human opponent. On random maps, people often build Snake Pits. The result is that you'll get a lot of cheap Wyverns. Yes, the enemy can do the same, but you can upgrade them. It's easy to upgrade a Warrior into a Warrior-Mage, whose strength and mana balance can be adjusted with artifacts. I rely on defense and try to upgrade it. I take Tactics, which is often available, and Water and Earth magic. On large maps, I try to get the Cloak of Resistance so that brute force and basic level 1-2 spells decide the battle. I remember my first victory with the Swamp against an opponent who had a two-Rampart advantage. He found a second Castle on the map. I had Tactics and 50 defense thanks to the Titan Shield, a couple of artifacts, and upgrades. I had Alkin. I simply pushed everyone forward. He didn't have magic to slow me down, and after his creatures attacked, I cast Prayer on everyone. After I moved all my units, the game was practically over