How the World Holds Its People
One rule. Short.
Chapter 21: On the Keeping of Souls
An Arkin is entitled to a world of their own making, but never to a world that is empty.
The rule is simple. You must always have at least one living denizen. The Vesper will not accept your last soul. An empty world is not a world.
The more souls an Arkin is permitted to keep in the living world, the more they are permitted to keep in the Afterlife. For every slot of life there may be one slot of memory, minus one. The world must always hold more life in it than memory.
Slots of memory are purchased quietly, each for a small fee. Slots of life are held on a yearly rhythm. When an Arkin gains a new slot of life, their cap of memory expands by one. The expansion is not automatic. The slot is yours to claim if you wish it. The Vesper does not push.