These are my own headcannons.

Entities can die. That's a fact.
But not from old age....

In the universe, to compensate for the superiority of abilities of the entities over the humans, there is a consequence to the actions they do and rely on the people around them.

There are so many scenarios and events that take place, each with its own consequences; however, below would list the actions that would impact the life of an entity.

What if:
- An entity can be killed by another entity
- when this happens, the ghost of the entity (that was killed) would haunt the killer until they reach some sort of peace.

- An entity can be killed by a human
- No effect (no ghost)
- However, it is harder for a human to kill an entity (if both entity and human were given the same weapon, the one handled by the entity would deal more damage).

- The humans of the nation/country do not associate with the country anymore.
- The entity's power (strength, ability to lead) would slowly weaken; however, this does not kill them.
- This happens to a greater extent when the humans associate with a country that the countryhuman has not passed the status to.
    ie. Anglo would feel some affects after passing the status to England, but it would not be as much as if the French dissociate with the     France and associated with Germany (hypothetical).

- All inhabitants of the country/nation die.
    - The entity dies. Simple.

- A union/ full-time entities (world/organisation/alliances) completely collapse
    - The entity which is the embodiment of the union/organisation dies.

(I may update this as the story progresses.)