The most useful monster.

By the way, I also enjoy playing as the Fortress. Sometimes, the advantages of this faction become apparent. Everyone criticizes Berserkers for their lack of intelligence. Yes, that's true! I don't argue. But at the same time, they can inflict significant damage on Bone Dragons. Their defense is mainly based on protection against ranged attacks and a retaliatory strike (fear). Berserkers ignore these defenses. There was a case in a battle against Death (the final battle) where Berserkers charged at the Bone Dragons, distracted their attention, and dealt a lot of damage thanks to their immunity to fear and double strike. This was enough to tip the scales in that encounter.