As humanity entered the Fourth Epoch, the era of interstellar voyages, the original role of the Light Cotton Birds was no longer relevant. However, due their earlier selection and training as military birds, which had resulted in high obedience and affinity towards humans, they gradually transitioned to becoming pets for decoration and performance.
These birds could cooperate with each other to weave arrays in the sky for performances, creating spectacles reminiscent of Venus spinning and meteors racing across the sky—quite a sight to behold. As such, they were also partly used in opera performances and large ceremonies.
However, it was towards the end of the Fifth Epoch that the Light Cotton Birds truly flourished.
With the expansion of wars, many planets were destroyed by deadly toxins and radiation. In order to survive in such environments, people urgently needed beings capable of wielding Angel Sequence spells and abilities.