Amidst the chaos in the large room of The Mother inside the vehicle's large structure and beyond, out into the murmurings and cheers of the crowd outside, in the background, is a sound coming from the East. It is some kind of music and chorus and it's getting louder.
Looking East you see the sun is setting and up against the ruby-red sun, there is a massive amount of giant birds. They appear giant because in their talons they are carrying humanoid figures. The humanoids are covered in fur of various earthen tones. There are both male and female humanoids. But some have dyed their pelts outlandish colors. The humanoids clutch weapons, which appear to be rifles. They also wear silvery helmets which cover their faces. The giant birds have human arms and hands that grasp cruder instruments of death, like swords and spears.
You can see there are different divisions marked by different colored birds and humanoids. They carry different weapons. There is a division which is playing the music. They have trumpets, reed instruments, and amplified stringed instruments.
They are and army. And they are all singing to the music. They begin to descend on The Thrice Church caravan.