That Time I Got Reincarnated as a Slime: The Demon Lord System, Explained

That Time I Got Reincarnated as a Slime: The Demon Lord System, Explained

Key Takeaways

  • Demon Lords in anime possess immense strength and control vast territories, requiring specific criteria to become one.
  • Evolving into a Demon Lord seed involves a dark process, including a Harvest Festival that requires taking 10,000 human lives.
  • The True Demon Lords form a council of the most powerful monsters, with membership based on specific conditions and alliances.

As a devoted fan of “That Time I Got Reincarnated as a Slime“, I must say that the world-building in this anime is nothing short of extraordinary. The Demon Lord system, in particular, has caught my attention like no other. It’s not every day you come across a fantasy where monsters are not just mindless creatures but complex entities with their own political structures!


In anime, fantasy realms host some incredibly powerful creatures, and the series “That Time I Got Reincarnated As A Slime” raises the bar even further. The Demon Lord system within this world serves as a substantial political framework, emerging from monsters’ capacity to advance in order to maintain human populations in balance by means of population control through elimination.

In Rimuru’s new world exploration, he frequently meets powerful monsters capable of transforming into Demon Lords. These beings wield immense power, command large territories, armies, and sometimes even entire nations. Therefore, readers should grasp the Demon Lord system to fully appreciate Rimuru’s journey.

The Evolution Of Demon Lords

The Strongest Monsters

In the lore of their realm, Demon Lords trace back their origins over two millennia. These formidable entities are renowned for their immense power and sway, second merely to the True Dragons in the series “That Time I Got Reincarnated As A Slime“. Becoming a Demon Lord, however, is no easy feat. Strict conditions must be met before a monster can even be considered a prospective Demon Lord. They should ideally hold an Special-A Rank or possess a Calamity-class threat level, which signifies the potential to annihilate a small nation. Furthermore, they require a substantial number of Majin subordinates of high rank, and their might can only be countered by a nation’s complete military force or a Champion-class human.

In magical terms, it’s essential that they possess a life force worth 200,000 units, which represents the amount of magical energy an entity holds. This energy can be referred to as magicules, mana, aura, or holy power. Creatures fulfilling these conditions are known as Demon Lord seeds. To reach their peak performance, they must participate in a Harvest Festival, where all restraints are shattered and their full powers are unleashed.

The Process Needed To Evolve From A Demon Lord Seed Is A Very Dark One

The Cost Of Immense Power

That Time I Got Reincarnated as a Slime: The Demon Lord System, Explained

When a beast fulfills all conditions to grow into a Demon Lord seed, it must experience an event called the Harvest Festival in order to transform into a True Demon Lord and reach greater realms. However, these Demon Lord seeds can only sprout and bear fruit by claiming ten thousand human souls for their spirit energy.

This process culls the human population as every Demon Lord candidate who wishes to awaken his true power would have to sacrifice many human lives in their quest for power. Rimuru Tempest’s Harvest Festival was on display for everyone to see, as he took no time slaughtering the Kingdom of Falmuth’s twenty-thousand-man army that dared to attack his sanctuary, killing a lot of his friends and citizens. After this Harvest Festival, Rimuru’s skills became Ultimate Skills, and his magicule capacity increased exponentially.

The True Demon Lords And Their Supreme Council

An Organization Of The Most Powerful Monsters

In the tale, a True Demon Lord is the title given to those who have emerged from Demon Lord seeds and secured their position on the ruling Demon Lord Council. The story features eight such True Demon Lords in total. They hold a higher social standing among Demon Lords who have successfully passed the Harvest Festival but have not been chosen for council membership.

Demon Lords are considered Disaster-level threats and have the power to challenge entire nations like Englassia with their armies of Champions. Their strength is usually measured between 400,000 and 800,000, but True Demon Lords surpass this with over 800,000. Only a unified group of nations or a special Hero called the Chosen can face off against these Catastrophe-class monsters, although they are not officially acknowledged as such.

The Demon Lord Council is an organization of these True Demon Lords, created by Guy Crimson in collaboration with Milim Nava and Ramiris (a group also known as Ancient Demon Lords who were the first set of Demon Lords to come into existence) two thousand years ago to oppose Rudra. The number of members and name of the organization has changed several times throughout the years, and it consists of highly influential and powerful monsters who lead monster societies. The organization first went by Ten Demon Lords, before switching to the Octagram, which only allows a maximum of eight members, which consists of Rimuru Tempest, Leon Cromwell, Luminous Valentine, Dino, and Draguel, in combination with the three founding members.

In the grand series, clashes between some of the most influential figures and personalities are inevitable. To address these conflicts, alliances, agreements, and other matters, the Walpurgis feast was created as a platform for these global forces to gather and negotiate through a majority vote system. To become part of this high-powered council, a Demon Lord must fulfill certain criteria, such as gaining the support of three council members and receiving approval from the Walpurgis itself before being officially inducted. When a newcomer like Demon Lord Seed emerges, the council assigns one of its members to evaluate their capabilities. Those who pass this assessment are put forward for a vote at the Walpurgis, where they are either inducted or rejected. Those who fail the test face execution by the council.

That Time I Got Reincarnated As A Slime is available to stream on Crunchyroll.

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2024-09-22 20:04