A small, seemingly harmless creature that nests within the body of a living host, gradually depleting its health while remaining undetected for extended periods. It operates systematically and silently, consuming the host's internal organs, starting with those less vital – such as the spleen or parts of the liver – which allows it to survive off its host for weeks or even months before noticeable symptoms appear. Due to its adaptability and stealth, the host often remains unaware of its presence until effective countermeasures are impossible.

Gutfester is a master of camouflage and cunning, and its presence only becomes apparent when it is too late for effective intervention. Initial symptoms include mild pain, fatigue, and weakness, which are easy to ignore or attribute to common ailments. As the parasite grows and its feeding intensifies, the symptoms become more severe – pain worsens, breathing difficulties arise, and the body begins to fail. In advanced cases, when Gutfester reaches full maturity, the host's body is so weakened that it can no longer sustain basic life functions, ultimately leading to death.

The body of Gutfester is soft and gelatinous, allowing it to move freely within the host without causing significant damage that might reveal its presence. It feeds on internal tissues and, in later stages, also on blood, absorbing nutrients necessary for growth and development. Interestingly, Gutfester can secrete substances that suppress the host's immune response, preventing the body from effectively combating it. Its secretions not only weaken immune responses but also have analgesic properties, allowing the parasite to remain unnoticed for even longer. These mechanisms enable Gutfester to grow unchecked until the host is entirely depleted.

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After exhausting the host's resources, Gutfester leaves the dead body to find a new host. This process typically occurs at night, as Gutfester avoids daylight. Once it exits the body, it slithers, using its stretchy form to move swiftly toward potential new hosts. Its method of transferring from one victim to another makes it extremely difficult to track, posing a significant threat to communities that may be unaware of its presence until it is too late. Additionally, Gutfester produces a protective coating of sticky substance that makes detection challenging by masking its scent and preventing its movement from being noticed. It often travels along building walls, hides in dark alleys, or conceals itself in dense vegetation to remain as elusive as possible.

Legends say that Gutfester appears where there is stagnation and decay, as though death and decadence attract it. Some stories suggest that Gutfester is not merely a biological parasite but also a manifestation of a darker force – an entity that feeds on suffering and death, thriving in the shadows for centuries, unnoticed by most living beings. There are accounts that it appears particularly in places afflicted by disaster, such as abandoned villages or battlefields, as if its presence echoes the tragedy and destruction that occurred there. Some believe that Gutfester is practically immortal as long as it finds new victims to infect and consume from within. Others mention attempts to banish it through ancient rituals, though none have proven effective in the long term.