The barracks in the Beastman Territory are currently level four, having unlocked the level-four military unit Beastman Tank, while the other four slots remain unopened.
At the stage of a level-four barracks, the cost to unlock military units exceeds tens of thousands, far higher than the summoning costs. Rosen felt there was no need to unlock units unless they were deemed very useful.
Upgrading the level-four barracks to level five opens an additional five military unit slots, with the barracks' armor similarly upgraded to reflecting armor.
Rosen examined the five new military units that became available.
He only unlocked two of them, which he deemed necessary to summon.
One of them is the flying unit "Frost Dragon Knight!"
The Frost Dragon Knight is considered a powerful flying unit among the Beastmen, recognized as a siege weapon.
Its freezing ability can be learned at the Beastman Research Institute.