The number has reached over three thousand of various flying species; it is definitely a rare treasure.
Let me tell you, even for the Beastman, it's very difficult to capture flying troops normally. After all, once they fall, it's practically a dead end. Capturing prisoners from the Flying Beast Alliance is incredibly hard.
Even if captured, given their high mobility, rescue would be very easy.
The Beastman Empire has strong warriors, and so does the Flying Beast Alliance, and their speed is even faster.
Now that such a large group of prisoners from the Flying Beast Alliance has been released, except for the Elves who aren't interested, the other major forces around are very interested.
Even Chirali and Klein, the two empires, are eager. After all, these could directly form flying troops.
Moreover, they are slaves, which means they are very obedient.
