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Ervas and Veronica were proposed something rather insane by Kireina.
She wanted them to eat her soul.
Although they had eaten Souls before, such as the Soul of Oggoth and the Necromancer, they always killed them when they did this…
They had never actually eaten only a piece of a soul, which made them rather worried.
They feared that if they were not able to control themselves as they bit, Kireina would be eaten by them completely…
And that was not their intention, to begin with.
Actually, they were rather worried about this and did not want to eat her soul.
This was not the primary reason why she was brought to Kritias, and it was not within their minds to ever eat a friend's soul.
However, Kireina offered her soul as if it were another treat, a simple snack… Which obviously made them rather worried about her mental health.
Check "The Protagnist's Sister Is Actually the Strongest"!