Like many fantasy isekai, That Time I Got Reincarnated as a Slime has several mechanics that are reminiscent of those found in tabletop role-playing games or video games and other types of fantasy media in general. One such familiar mechanic found in TenSura universe is evolution, a dramatic increase in an individual's overall statistics that, as a result, grants them access to a number of unique abilities and advantages.

In the second season of the anime, Rimuru dramatically ascended to the status of True Demon Lord after acquiring a large mass of souls as part of a ceremony that not only saw him become a True Demon Lord in name after being accepted by the other Demon Lords, but also as a being. Humans are capable of undergoing the same type of evolution, which allows them to follow a similar but opposite path to that of Demon Lords, but how exactly does human evolution work in That Time I Got Reincarnated as a Slime?

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The human evolutionary trajectory

As above, so below

Humans have access to two possible evolutionary paths in At that time I reincarnated as a Slime, Lighting or Majinization or Monsterization. Enlightenment occurs when a human being undergoes very long and difficult training, eventually breaking through a significant mental barrier. In doing so, the person becomes a “semi-spiritual” life form, capable of thinking through the Spiritual Body; one of the five main vessels thought to house the soul in the That Time I Got Reincarnated as a Slime universe. Their flesh has partially ascended to a higher plane of existence, making the Enlightened One much more tolerant of magic than the average human, and they have a longer life expectancy.

On the other hand, Majinization is an evolutionary path in which a person who has experienced great levels of exposure to magic becomes a monster. This is something that can occur as a result of occult rituals or unique circumstances where normally overexposure to magic results in death, a person may experience rebirth as a “monster”.Demonoid“instead. At both ends of the spectrum, an individual can achieve even higher and more powerful modes of existence through cultivating their abilities, bodies, and lives in order to break through their mental barriers. The result of this is seen in the Ten Great Saints.

After Enlightenment

Becoming a fully spiritual being

If a human becomes an Enlightened One, further cultivation of their abilities may enable them to complete the awakening process and become a Divine Human. These individuals are extremely powerful, and because they are divine beings, they gain material bodies that do not age. In the case of those who have followed the reverse path, a Demonoid can become even more powerful as they reach states such as Greater Majin, Sub-Demon Lords, and eventually Demon Lord level. Characters such as Hinata Sakaguchi and Demon Lord Leon Cromwell serve as prime examples of evolution on both ends of the spectrum, though at this point in the anime, Hinata Sakaguchi has yet to ascend to the immense heights that are possible for humans in the series. Divine Humans are so powerful that they can be on par with True Dragons, and their counterpart on the demonic side of things is known as a Divine Demonoid. On both sides, Divinity is a possibility indicating that an individual has gone through the complete process of awakening and become a transcendent being, and as long as the individual is a spiritual life form with a physical body, transcendence is a possibility.

Enlightened or Divine Humans are not to be confused with Higher Humans, the first species created by the vampire Twilight Valentine who had a long lifespan and also magical affinity; however, due to their selfish and violent nature, they were considered a failed creation and driven to the brink of extinction by the Dark Lord, Guy Crimson. The human race as it appears in the series is the result of further experiments by Valentine. Demi-humans, on the other hand, are simply the result of crossbreeding and also experimentation with humans, and despite being fully human, there is immense animosity between them and normal humans. Each of these varieties of humans found in That Time I Got Reincarnated as a Slime are capable of evolution, meaning that a human, demi-human, or High Human can achieve the aforementioned milestones.

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That Time I Got Reincarnated as a Slime

Based on the novel and light novel series by Fuse, That Time I Got Reincarnated as a Slime is an isekai anime that follows Rimuru, a guy who is reincarnated into a fantasy world as its weakest monster. However, that soon changes.