Editing Monster Girl Encyclopedia II (section)

=== Undead and Incubi ===
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Almost all of the residents of the kingdom of the undead are either undead monsters or their accompanying incubi. Though most undead arise from human women, there are also undead elves and dwarves, as well as the dragon zombie described later in this volume. In fact, any monster that dies with regrets has the potential to rise as one of the undead. The kingdom of the undead is, therefore, quite diverse.

Age has never been observed as the cause of death in any of the undead. Undying, they are thought to be virtually immortal. Upon becoming incubi, the lifespans of the undead's husbands are drastically extended to match that of their partners. Such implies that the men, too, become virtually immortal and join the ranks of the undying.

Incubi are human men who have been adapted to the undead. However, there are also many in the kingdom of the undead who have died and risen as undead-through their difference in appearance may not be obvious. But while it is easy for human women to rise as undead when monster mana takes root in their corpses, raising the corpse of a man is not so easy, as his ability to produce essence must also be revived. Even so, it is possible to bring a man back to this world through a ritual(which will later be described) to borrow divine power and through a perpetual sacrifice that grants mana. In other words, a monster who will live alongside the risen man forever in carnal union.

In the towns, monsters such as ghost and will-o-the-wisps can be seen playing with substances that resemble the hazy glow of flame. This is the most a human can discern of the object, which can only be identified by monsters- but it is in fact the soul of a human man. Such monster races, mere materialized souls, are capable of interacting with those who are naught but soul. In this way, they come to live with them, together as husband and wife.
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