Azuroms

Cassandra stared up with her mouth hanging open and her eyes shining from the strangeness of the view. 

The passageway seemed to have been lit with thousands of blue fireflies. Their lights glowed without blinking and covered the entirety of the cave's roof, as if it had disappeared and heaven stared back down with twinkling blue stars. 

"Wow! What are those?" Cassandra asked in bewilderment, holding onto Siroos's shoulders. 

He had a very wide smirk going, knowing that she was going to glow just like these insects hearing his explanation. 

"Azuroms, they glow when the scents of two mates mingle. They reproduce with the true fragrance of the mates," Siroos explained, watching Cassandra's astonished eyes which had been illuminated by the blue light.