One thing that had limited the Star Monarch from moving his Star Legion around like most armies, ultimately leading him to develop Planet BlueCrest, was that some lacked the ability to transform their bodies into humanoid form.
Some could, but they were limited to certain features, and in most cases, when in humanoid form, their power was capped at 70%, which significantly hindered their combat abilities.
In fact, out of the 1 million beasts in the Star Legion, only 30% could take on human form, and even so, out of that number, only 10,000 could take on perfect human form and retain their power at 90%.
The rest were severely limited, so they chose to remain in their beast forms, and for years it had been so.
However, this was changing, and that started with the 40,000 beasts gathered before him. By rekindling their connection with him, Klaus had unknowingly triggered the awakening of innate talents, every last one of them bringing their human forms to life.
