Eiko managed to convince Iris to make Astra leave the room before Lux told her about their adventures in Elysium.
The baby Slime didn't want her rival to hear how powerful she had become and wanted it to be a surprise to him later. Iris agreed and asked Astra to head to the training grounds to prepare for his battle with Eiko, which the Unicorn thought was a big joke.
Even so, for Iris' sake, he left the room and allowed Eiko to monopolize Iris for a short period of time.
Astra was confident that he would easily win against the baby Slime who still didn't know her place in the hierarchy of beasts that protected Iris' safety.
The moment Astra left, Lux began to tell Iris about the details of the adventures they had in Elysium. The young beauty's eyes would widen in shock from time to time, and her mouth would open and close as the red-headed teenager told the tale of things that seemed impossible to have happened inside a Beginner's Zone.