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Homunculi were tiny constructs created by spellcasters to act as spies and servants. They were created through mysticism and alchemy, using the spellcaster's own blood in the procedure. This blood-link provided a special bond between the homunculus and its creator. The construct was completely loyal to its master and could telepathically transmit anything it saw or heard back to its creator. Although they possess a telepathic link to their creator, homunculi cannot verbally speak.
The appearance of a homunculus varied based on the will of its creator. Many homunculi appeared to be a winged humanoid creatures, similar to gargoyles or tiny demons. Some spellcasters made their homunculi appear more human; vain mages even made these constructs look like themselves.
Creating a homunculus was a lengthy procedure involving creating the construct's body from clay and ash and mixing it with the blood of the creator. This blood link allowed the creator to see and hear everything the homunculus experienced. However, there was a drawback in that if the construct was slain, the creator suffered damage.