Undead

Undead (屍人, Shinin) is a general name for reanimated corpses that are raised by a caster and follow their bidding. They are also known as corpse soldiers (屍兵, shihei) and zombies (ゾンビ, zonbi).

Information
An undead can be made by the Sacrament of the Immortal King, a type of magic that returns a soul to the body it left. The forbidden technique was developed by a Witch who could completely resurrect the dead, making them look exactly as they had in life, though the spell has mostly faded from living memory and it is impossible to realize without a caster who has an innate aptitude for it. However, if the spell were to be successfully replicated, it could allow the deceased to be resurrected. It is only possible for a caster of the Sacrament of the Immortal King or a person given authority by the caster to control undead.

There are two main undead variants that have been presented in the overall story thus far; they are usually differentiated from one another by name. Basic undead that only follow simple commands are called corpse soldiers, whereas undead with abnormal vitality are dubbed zombies.

Corpse Soldiers
Corpse soldiers are an undead variant that are limited to have the capability to follow simple commands. They are manufactured with an incomplete version of the Sacrament of the Immortal King, and for that reason, their souls do not reside within their reanimated bodies. They can be resurrected as a rotting corpse, be resurrect after having their bodies preserved through magic, or, as seen with Theresia van Astrea, may even seemingly have their age reverted to a younger version of themselves. When a corpse soldier receives fatal damage and is unable to maintain its form, it is reduced to ash. However, some corpse soldiers have been observed to fulfill a lingering impulse or converse with other people before fully perishing.

Despite the great power that they may have had in life, a corpse soldier's martial capabilities are lessened from their original levels. They are also unable to feel pain, and can even survive what would typically be a mortal wound for a living person or function without vital body parts like the head.

Zombies
Zombies are are an undead variant with abnormal vitality. On two separate occasions, Aldebaran and Natsuki Subaru used their Earth knowledge to describe this type of irregular fauna as “zombies”. There are two types of undead known as zombies, both of which were created by Sphinx.

Parasite-Based Zombies
The first type of zombies were moving corpses that had irregular energy, having the capability to move after a normal body's weak points, such as their heart or the neck, were destroyed. Their bodies were bloodless and due to the flaws in their creation, decomposed over time. These zombies were created from contaminated water containing parasites that turned people into undead. Once they were ingested, the parasites gradually took control of the brains of men and eventually gained full control over their bodies. When the parasites completely manifested in a body, they appeared as tentacle-like appendages which displayed the capability to move, and they acted as if they had a will to survive. Peculiarly, the parasites could not control children and most women despite residing in their bodies, with the exception of one undead woman who acted as the queen of the parasites.

The zombies made from these parasites themselves had differences. Some were unintelligent and acted similarly to corpse soldiers, yet others could speak. Regardless of their inequalities, both the conscious and mindless undead could meld together into one form. They could assemble into a singular inhuman entity that was effectively a lump of rolling zombies, or one zombie could assimilate others into itself. According to the parasite controlling the body of Edda Rayfast, the speed of the parasites' growth was fast; they were corpses that could only move once their hosts' brains were rotted at first, but over time, as the hosts' intellect and thought processes remained intact, it was believed that they could control hosts when they were completely alive and eventually create natural-born zombies. Furthermore, they were tasked with the mission to create a paradise where their maker could be at peace. In a village of the Barielle Barony with men controlled by these parasites, the self-aware zombies tried taking the place of the men and appeared to be replacing their lives entirely. A similar zombie type appeared in a minor city of Kararagi.

Corebug-Based Zombies
The second type of zombies were reproductions of deceased people with the memories they had up until their deaths, but rather than having their original bodies, the zombies' vessels were made of earth.

Corpse Soldiers

 * Tholter Weasily
 * Pivot Arnancy
 * Libre Fermi
 * Kurgan
 * Theresia van Astrea

Zombies

 * Edda Rayfast
 * Balleroy Temeglyph
 * Carillon
 * Lamia Godwin
 * Izmail
 * Valgren
 * Palladio Manesque
 * Viva
 * Eugard Vollachia
 * Rowan Segmunt
 * Sphinx