☀️ Arselia and Akonia

Is there any way to heal at all?

Medicines, elixirs, etc., don't work on you or the Hero (but the flower does), and your health will regenerate on its own the next day.

If you need to appear for some non-aggressive interactions, what does that look like? Like a person, like a transparent person, like non-transparent clothes on a transparent body?

Like a semi-transparent person with a sinister aura. The clothes are part of you.

Are all traps ignored? Are there chests there?

If they are not of a magical nature, then yes.

How do you turn pages, hold a quill, put items into a ghostly bag – with telekinesis or with ghostly hands?

With your hands, but for those who can't see you, it will look like the items are moving on their own.