Your name shall be Diablo. Receive that name, and become my guardian deity!

—Rimuru naming the Arch Demon upon Rimuru's awakening as a True Demon Lord

Demons (1)
Biographical Information
Name Diablo
Blessing Tempest Crest (former)
Great Demon Lord's Blessing
Title(s) Demon Lord (Demon God King?)
Heavenly King
True Demon Lord
Gender Male
Species Demon God (Highest tier Demonic Spirit)
Evolution Demon Duke
Arch Demon
Hair Color Red (WebNovel)
Black (LightNovel)
Eye Color Crimson Gold
Status Alive
Professional Information
Country Tempest
Rank S [EP: 444,000] (Before Awakening)
SS [EP:1,000,000+] (True Demon Lord)
Affiliation Black Corps
Post Demon Butler
Debut Information
Web Novel Debut Chapter 70

"Demon Lord" Diablo ["魔神王"デモンロード ディアブロ, "Majin Ou"Demon-Roodo Diaburo] is a Demon God and a loyal servant of Rimuru Tempest. After being named, he has evolved from a Arch Demon into a Demon Duke; and after being awakened into a True Demon Lord (and Rimuru turning into a Great Demon Lord), he evolved into a Demon God.

As one of the most powerful figures in Tempest, he is one of Rimuru's Twelve Patrons and also the current leader and founder of the Black Corps.

Among Rimuru's subordinates, he is one of the strongest three individuals, along with Benimaru and Zegion.

Appearance Edit

As an Arch Demon, he was a beauty whose gender was indeterminable. He possessed crimson hair while his eyes had golden irises and black scleras. Often appears to be elegantly dressed in a professional butler uniform and carries himself with an air of dignity.

Personality Edit

As a summoned demon who has been given a name by Rimuru, he is extremely loyal to his master. When two of his subordinates were sacrificed to fuel Rimuru's revival spell, he felt envious that they could be of use to his master. His aim is to be Rimuru's right hand man.

Aside from treating his master humbly, he often speaks politely to both his allies as well as enemies.

Past Edit

Diablo has always been an absurdly strong demon who loved to fight. Since the beginning he would battle Angels at every meeting in a long unavoidable fight. These fights were too destructive, so they would only fight every 500 years for seven days. Diablo would get very bored during this intermediate times. And since he was a demon, (angels as well) made of pure energy, unless he had a physical body he could not interact with the physical world.

For him fighting simply meant trampling his opponent. Even in fighting the Angels he would massacre them.


Birth of a Demon Lord Arc Edit

By offering the corpses of the Blood Shadows and the 15,000 human soldiers, Rimuru successfully summoned an Arch Demon and his two Greater Demon subordinates. Using the corpses, they were able to successfully materialize and his first order for them was to capture the three escaping Blood Shadows, and bring them to Ranga.

When the secret revival art was lacking the necessary energy, the Arch Demon offered to sacrifice his subordinates, stating that they were delighted to be of use to Rimuru. Hence, when Rimuru awakened, he was grateful for his efforts and allowed the Arch Demon to become one of his comrades. When Rimuru found out the Arch Demon didn’t have a name, he named him "Diablo", tasking him to become his guardian deity. After Diablo was named, a black cocoon enveloped his body, creating a perfect evolution posture.

It is later revealed that he had created this body by using a massive quantity of magical power that he had saved for a long time, and thus transformed into a Demon Duke. This magical power was immediately replenished through his link with Rimuru. He believes that in the Demon world there is no existence higher than him. But even he cannot fathom the depths of the strength of his beloved Master Rimuru.

Saint Demon Confrontation Arc Edit

"I am not an Arch demon like you had previously said, but a Demon Duke." - He reveals so while battling a Templar Knight.

It is later revealed that he was no longer an Archdemon, but a Demon Duke. According to the existing records of Demonology, a Demon Duke is a legendary existence and is supposedly ranked higher than a self-proclaimed Demon Lord. There has been no other Demon Duke summoning previously documented.

Founding the Demon Capital Arc Edit

Demon Lords’ Gambit Arc  Edit

Empire’s Invasion Arc Edit

Abilities Edit

High hand to hand combat skills, can clad himself in Demon Lord's Ambition (Haki) and was able to beat Shion and Baretta in hand to hand combat.

After his Evolution into a Demon God, his magic amount becomes approximately EP: 2.000.000

Magic Edit

  • Dark Magic
  • Magic Energy Manipulation Archive
  • High Demon Summoning

Species SkillEdit

Ultimate SkillEdit

  • Temptation King Azazel
    • Thought acceleration
    • Space Time Control
    • Multidimensional Barrier
    • All of creation
    • Penalty Domination
    • Temptation world

Unique SkillsEdit

Extra SkillsEdit

Daily SkillsEdit

  • Universal Perception
  • Demon Lord's Haki

Battle SkillsEdit

  • Phenomenon Control
  • Charm Domination
  • Torus Secret Art


  • Physical Attack Immunity
  • Abnormal Status Immunity
  • Mental Attack Immunity
  • Natural Elements Immunity
  • Hybrid Attack Resistance


  • Scissors(Bladed Claw Scissors): The appearance is like three claws and symmetric. The length of each claw being 1 m , a sharp double-edged sward. Special weapon made by Kurobee for Diablo (it was destroyed by Benimaru)

Relationships Edit

Rimuru Tempest Edit

He is truly loyal to Rimuru, and he will spread a calamity by his request. even if Rimuru tells him to kill himself he will do it without hesitation. His loyalty is more like a religious fanaticism.


The Devil Lords trio names:

The Demon Nobles' names:

The executors



Trivia Edit

  • He has red hair color in the Web Novel and black in the Light Novel.
  • His name, as well a the names of all Demons named by Rimuru except Beretta, comes from a car, in this case the Lamborghini Diablo.

Major and Minor BattlesEdit

Evolution Edit

Ch. Evolution Stage Trigger for


Rank EP New Skills / Abilities


Arch Demon Summoned by Rimuru, given 15,000 corpses A
72 Demon Duke Named by Rimuru A+ 444,000 Unique Great Wiseman (Thought Acceleration, Thought Domination, Incantation Void)

Enchanter (Fascination, Seduction)

Battle Law Manipulation
Extra Multiple Barriers, Spatial Travel
Daily Magic Perception, Demon Lord's Ambition
Resistances Physical Attack Nullification, Natural Effect Nullification, Status Change Nullification, Spirit Attack Resistance, Holy Magic Attack Resistance
109 Unique Enchanter (Paradise Time (World's End))
Battle Fire Balls


Teleportation (has no lag)


Bladed Claw Scissors (Life's Harvest)
163 True Demon Lord Granted 100,000 Souls by Rimuru 1,000,000+ Ultimate Temptation King Azazel