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Tensei Shitara Slime Datta Ken is a Web Novel written by Fuse, and has since been adapted into a Light Novel, Manga, and Anime. The story follows a normal 37-year-old guy, Mikami Satoru, who after being stabbed and killed by a robber, finds himself reincarnated in another world as a blind slime with unique skills. With the new name "Rimuru Tempest" given to him after meeting his new friend, the "catastrophe level" Storm Dragon Veldora, he starts his slime life in another world, while on the way building a city for monsters and increasing his number of subordinates.

Note: The Web Novel and the Light Novel are different continuities with different stories and thus cannot be used to scale to each other. The Manga and Anime, due to being adaptations of the Light Novel, cannot be used to scale to the Web Novel.

Characters below Awakened Demon Lord level are usually around town level and subsonic to hypersonic+, while Awakened Demon Lords are capable of destroying entire continents and moving at relativistic+ speeds. Characters around the True Dragon level are capable of destroying the universe and moving at FTL speeds. With the strongest characters being capable of creating multiple universes.

Spiritual life forms doesn't have a physical body and exist only as a soul. Soul is a lump of information. Spiritual life forms will regenerate as long as the core inside their soul isn't completely destroyed. Higher level spiritual life forms are capable of moving in stopped time.

There are numerous hax abilities in the series like Conceptual Manipulation, Information Manipulation, Soul Manipulation, Probability Manipulation, Fate Manipulation, Reality Warping, Time Manipulation, Acausality, Abstract Existence, Intangibility, Causality Manipulation, Law Manipulation, Existence Erasure, Magic etc.

The god of the multiverse, Veldanava after being bored in complete nothingness, created the entire world which has several parallel universes, and all its rules and all abilities in the series.

Scaling Chain Explanation

Hazard Class A-ranked monsters are described to be capable of threatening entire nations, and other lifeforms of the same rank are on the same level of power, albeit not necessarily with the same destructive capacity (as there are humans who rely more on their equipment that bolsters their statistics to fight against monsters, meanwhile monsters may have the corresponding energy but not the area of effect or skills necessary to cause immediate widespread destruction). Their Attack Potency is currently downscaled from the Special A calculation of the Sky Dragon, via the ratio between Demon Lord Seed Disaster Class and Calamity Class, as well as direct scaling comparison statements that are deemed more accurate.

• A-minus characters like Gobta are High 6-C (439.075 Gigatons)
• A-ranked characters like Shuna (Pre Harvest Festival and Gabiru (Pre Harvest Festival) are High 6-C (878.15 Gigatons)
• A-plus characters like Gaiye, Shizu's S-Class Students, and other, stronger majins like Arch Demons are Low 6-B (4.83 Teratons)

Special A Rank, also known as Calamity Class, can be roughly divided into two levels. Sub Demon Lord level includes majins described to be capable of destroying countries, as well as fledgling Enlightened ones. Meanwhile, more powerful Enlightened as well as monsters who are Demon Lord Seeds and those comparable to them are under the Demon Lord bracket. They range from Country level up to Country level+.

• Characters like Ifrit, Geld (Pre Harvest Festival) and Ranga (Pre Harvest Festival) scale to the Sky Dragon's 6-B feat (12.36 Teratons)
• Higher 6-B's like Orc Disaster Geld, Treyni (Dryad), the Kijins and the Beaskeeters scale twice above the Sky Dragon's feat (24.72 Teratons)

S Rank, also known as Disaster Class, can be comprised with exceptionally powerful Enlightened, Saints and growing Demon Lord Seeds, ranging from Country level up to Large Country level. True Demon Lords, True Heroes, and those on par with them like high level Saints and monsters are Continent level or even far higher.

• Even higher 6-B's like Treyni (Dryas Doll), Clayman (Base) and those comparable to them scale from Treyni being twice as strong as before and downscaling from Carrion (49.44 Teratons)
• High 6-B's like Rimuru Tempest (Slime) and those that are comparable to him downscales from his more than ten times increase in magicules (156 Teratons)
• Characters like Transformed Carrion, Shizue Izawa and Awakened Clayman scale to (468 Teratons)
• 6-A's like Laplace, Hinata Sakaguchi (Enlightened), old Granbell Rosso, Roy Valentine and Charys and those on their level scale even higher (780 Teratons)
• Characters like Demon Lord Rimuru, Ruminas Valentine, and Hinata Sakaguchi scale to the destruction of the Great Jura Forest (1.56 Petatons)

Explanation on Some General Concepts in Tensei (This only applies to the Web Novel version although there are some parts that applies to the Light Novel but some of them don’t since it got retconned)