Tactics for the Swamp (Fortress).

Yeah, lizards are meat. Viverns and snakes aren't great either. But it depends on the hero. And if the hydras don't need to move, but you do, it won't be very pleasant. Gorgons are generally not good at level 5, at least level 6. I play as Dungeon, and I can confidently send only minotaurs against gorgons. And if you're also playing as Alkin, you can tolerate gorgons. Besides, the faction's defense and attack aren't weak.