Did you skip something? Or missed something about the last 53 chapters?
The pink fox prevented Nain to loss his memory again like the other times when the ritual was done. He more or less tested then and asked about the parrots and his servants all lied to him. Showing that they had done this each time and so Nain is more suspicious now. He then revealed that he knew they lied hence why Rue and the others were terrified.
And leshas are somewhat of a higher rank of servant meant to serve the Shas in everyway now and in the afterlife. Somewhat of a concubine without anything to do. Rue became one cause he thinks that this makes him closer to Nain just like Gwen.

so like what happened in this chapter? i feel like i should reacting some type of way like something about the parrots. was na-in supposed to forget about the parrots cuz of the ritual that happened previously? is that why rue was apologising? and what is a leshah? why was it shocking that rue became one?
please someone explain