They’re wiping his memory. They do it when he gets depressed or traumatized.
I saw a while ago someone said in the past na in killed himself and that is why they block his memory. So he isn’t sad.
Σ( ￣□￣||) poor na-in
I finished the novel a long time ago, so I don't remember all the exact details. I'm just going off what I can remember.
SPOILERS!!
Na-in adopted and raised a human child a long time ago (he doesn't remember now), but the child died in an accident. After that, Na-in became so depressed that his emotions was affecting his physical body where he would slowly start disappearing, basically killing himself. Amon was just adding more salt to the wound as he didn't understand why Na-in was grieving over a human.
The problem is that Amon can't live without Na-in. Since they're connected, if Na-in dies, Amon dies too. Amon didn't want Na-in to die, a priest suggested using a special incense that would ease Na-in's pain by making him forget it, along with parts of his memories. That way, he wouldn't completely disappear.
Again, I might be missing something lol that's how I remember it.
Okay did they said what is the rituals for if not can someone spoil the reason for me