Issyrha had returned to the human kingdom on Reina's word so that her people wouldn't be worried about her. Issyrha had let Kai and Reina's close confidants know of her condition the moment she returned and though they had seemed worried at first they were relieved to know that Reina was doing well.
After that she had left to stay at Eldarf since she had another purpose now. To get stronger.
The youngest had nearly sacrificed every drop of her mana to save the world and probably had also prevented her fight with the Demon Lord alone.
Issyrha knew Gluttony from the days of the Great War so, she knew while Gluttony was one of the seven Demon Lords who could easily ravage the world when descended it was still another thing to enter the space where they were banished to.
Nefrakar.
Just like the Demon Lords, even uttering the name of that place was a bad omen.
That was why both Issyrha and Caelthir had yet to let Reina know about their enemy.
