The creature Jiang Shan described is the Meat-Winged Monster.
Xiang Beifei understood.
The Moon God Race has two forms. When they show their murderous intent, they reveal their true form as Meat-Winged Monsters resembling toads with long wings and horns. Normally, they disguise themselves as holy white birdmen.
To control the Human Race, they first have part of them transform into the ferocious image of the Meat-Winged Monster to attack the village, then let another part appear in a holy form to repel the so-called "Netherworld Evil Spirits", making the captive Human Race genuinely grateful to these holy deities.
This self-directed and self-acted drama, they perform quite well.
It seems necessary to let these humans realize the connection between the Meat-Winged Monsters and the birdmen.