Deep Storage
"Deep Storage" (though that is just its colloquial name) is a prison based in Aronharl where the inmates are transformed via True Polymorph and kept in storage.
When they need to be questioned, they are dropped into anti-magic fields which suppress the polymorph for the duration of questioning.
It's perfect for the ultimate threats to Eternium, those whom possess vast knowledge, or whom The Dragonlands believe have methods of escaping a direct death.
Though the existance of "Deep Storage" is widely-known, it's precise location (and means of access), is a highly guarded secret.
Purpose / Function
It's perfect for the ultimate threats to Eternium: Those whom possess vast knowledge, or whom The Dragonlands Empire believe have methods of escaping a direct death.
Architecture
Little is known of what Deep Storage looks like - some believe it to be underground.
