If a kingdom is ruled legitimately and fairly (enough) by a lich?

[Bohandas]

In 5e, you have to commit mass murder to *keep* being a Lich, as you need to eat souls regularly. The process of transforming into a Lich involves charming little things like bargaining with evil entities to even learn how to do the ritual, which most likely will leave the caster heavily indebted to them, and then you have to kill yourself by ingesting a mix of poison and the blood of a sapient creature whose soul you're destroying.

So basically a knockoff of the Emperor from WH40k?