Slime

Slimes (粘性体) are common Spectres and Demi-Spiritual Lifeforms. They are one of the weakest Monsters known to exist. Self-awareness is something that is seemingly impossible for Slimes.

Slime species are typically thoughtless creatures that only absorb, split, and regenerate. They also usually never leave their territories. It is possible for an intelligent Slime to naturally come into existence as a Unique Monster, though there hasn't been any such occurrence as of yet. They are seen emerging from the ground in large numbers during hot weather.

The Slimes in magicule-deprived regions are extremely violent and strong since there is a need for survival.

Abilities
Slime bodies are a composition of identical cells. Every cell can serve as a brain cell, nerve ending, and muscle at the same time. Thus, as the thought process is undertaken by different cells at different times, sleep is unnecessary.

Slime bodies move and are sustained with magicules. Since oxygen is unnecessary, no form of breathing occurs. They lack hunger and thus have no need for physical nourishment.

Intrinsic Skills

 * Absorb (吸収): Allows slimes to take things inside of their body.
 * Dissolve (溶解): Dissolves almost anything in contact with or inside of the slime.
 * Self-Regeneration (自己再生): Allows for the regeneration of body parts.

Known Slimes
As of now, Rimuru Tempest is the only intelligent and the most powerful one encountered in the world. Due to the average perception of slimes as unintelligent, Rimuru's opponents are often caught off-guard on the first encounter. He later evolved into a Demon Slime as a result of becoming a True Demon Lord.

Trivia

 * Slimes are said to be a delicacy during hot weather by the Tempest residents, however, this may just be the monsters trying to taunt Rimuru and scare him.
 * In areas with poor magicules concentration, monsters and small animals serve as an alternative food for Slimes.
 * Although the series is about the main character being reincarnated as a slime, we don't see any other slimes other than Rimuru until much later in the main series. They do however often appear in various spin-offs such as Isekai Memories or The Slime Diaries.

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