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Rimuru Tempest and Diablo are on the same side, which is exactly why this matchup is so fun. One is Tempest’s Demon Lord and the central force behind its explosive rise. The other is the primordial demon who walked into Rimuru’s service by choice—and immediately became one of the most frightening people in the room.

For this battle, the rule is simple: anime material only. No light-novel scaling, no web-novel endgame feats, and no borrowing abilities that have not appeared in the anime. That restriction matters a lot. Tensura’s later material changes the scale of nearly every major character, but the current anime versions tell a more grounded, much clearer story.

Rimuru is still the favorite. He has more confirmed high-level tools, a broader combat kit, and the authority of a True Demon Lord. But Diablo is not the kind of opponent who gets erased from a versus debate with one big number. His experience, spellcraft, and refusal to stay down make this a serious internal Tempest showdown.

What “current anime version” means here

This comparison uses the latest established anime portrayal of both characters. Their known skills, transformations, demonstrations in battle, and stated status are fair game. Material that only exists in the novels is deliberately off the table.

That also means there are limits to what can be claimed. The anime has shown that Diablo is immensely powerful and that Rimuru regards him as an elite subordinate, but it has not given viewers a full, unrestricted Rimuru-versus-Diablo duel. Any exact outcome is therefore interpretation based on what the anime has confirmed—not a canon event.

It is worth making that distinction because anime-versus debates often collapse when later-source information gets mixed into an anime-only fight. We are judging the versions viewers can actually see on screen.

Rimuru’s biggest edge: a complete, adaptable arsenal

Current anime Rimuru is much more than a powerful slime with overwhelming magicules. After becoming a True Demon Lord, his entire presence changes. He gains a huge increase in power, evolves physically and spiritually, and becomes capable of operating at a level far above most monsters and human fighters in the series.

His most decisive advantage is versatility. Rimuru doesn’t need to win every exchange the same way. He can analyze, defend, recover, absorb, counter, restrain, and alter his approach as the fight develops. That flexibility is dangerous against anyone, but it is especially valuable against Diablo, whose own style is built around traps, knowledge, and magical pressure.

Raphael makes a straight fight difficult for Diablo

Rimuru’s Raphael is not merely a source of advice. In practical combat terms, it gives Rimuru exceptional analysis and support. It helps him understand threats, manage skills, optimize responses, and avoid wasting moves. Against a fighter as clever as Diablo, having that level of processing is massive.

Diablo can surprise opponents who rely on instinct or raw force. Rimuru is neither. Once Raphael begins reading Diablo’s patterns, spell structure, and preferred tactics, Diablo loses some of the mystery that makes him so lethal.

Rimuru has also demonstrated the value of rapidly assessing opponents in earlier confrontations. His growth is not just a matter of hitting harder; it is the ability to turn information into a winning answer. In a long battle, that tendency strongly favors him.

Predator and Gluttony remain nightmare abilities

Rimuru’s absorption-based abilities have always been central to his danger level. They are not an automatic “I win” button against every strong opponent, especially one with Diablo’s resistance, awareness, and magical power. Still, they create a threat Diablo has to respect every second of the fight.

Rimuru can consume targets, materials, attacks, and useful information under the right conditions. Even if Diablo avoids direct absorption, he must fight knowing that a careless magical barrage or a bad close-range exchange could become fuel for Rimuru rather than damage.

That changes the rhythm of the battle. Diablo wants control. Rimuru’s kit makes control expensive.

Why Diablo is far more dangerous than a subordinate label suggests

Calling Diablo “Rimuru’s subordinate” can make people underestimate him. That would be a mistake. Diablo is a primordial demon, an ancient and highly intelligent being whose confidence is not empty arrogance. The anime consistently frames him as someone other powerful figures should take seriously.

His loyalty to Rimuru is genuine, but this hypothetical removes that loyalty from the equation. If Diablo were actually fighting to win, he would bring the same calculating cruelty and composure he shows against Tempest’s enemies.

Experience is Diablo’s best weapon

Rimuru learns at an absurd pace, yet Diablo has the kind of long-term battle sense that cannot be reduced to a simple power level. He understands intimidation, misdirection, magical timing, and how to make an opponent reveal an opening. He does not rush because someone looks stronger.

That composure is important. Many fighters would panic when Rimuru begins adapting or when the scale of his power becomes obvious. Diablo is much more likely to test the edges of Rimuru’s defenses, use layered magic, and search for a route to a decisive strike rather than trying to overpower him head-on.

In other words, Diablo gives Rimuru a thinking opponent. A very dangerous one.

Diablo’s magic and regeneration keep him in the fight

Diablo’s demonic nature gives him formidable survivability, and the anime has shown that he can treat attacks that would end ordinary combatants as little more than inconveniences. His magic is also flexible enough to threaten opponents from different ranges and force them to deal with more than brute force.

He can pressure with destructive spells, exploit emotional weakness, and use fear as a weapon. Against most of Tempest, that would be enough to dictate the whole fight. Against Rimuru, it earns Diablo time—and time is what an intelligent combatant needs to find opportunities.

That is the strongest case for Diablo: not that he simply has greater raw power, but that he is skilled enough to make the superior fighter work for every advantage.

Ultimate Skills: the key gap in the anime portrayal

The owner’s central point is hard to ignore: Rimuru has four Ultimate Skills in his current anime form. The exact mechanics of Tensura skills can be complicated, but the broad matchup implication is straightforward. Rimuru possesses a level of high-end authority and utility that Diablo’s current anime portrayal has not matched with an equivalent confirmed collection of Ultimate Skills.

Rimuru’s four are:

• Raphael, Lord of Wisdom, for analysis, control, and support.
• Beelzebuth, Lord of Gluttony, which expands his already terrifying absorption and consumption potential.
• Uriel, Lord of Vows, associated with powerful defensive and control-oriented functions.
• Velgrynd, Lord of Scorch, acquired through the relevant anime events and adding another major layer to his arsenal.

These are not four identical damage boosts. Their value lies in coverage. Rimuru can think faster, defend more effectively, consume threats, and draw on a wider set of high-tier options. Diablo may be the more seasoned schemer, but Rimuru has answers for too many different battle states.

There is a sensible counterpoint, though. Having more Ultimate Skills does not mean every one can be used perfectly or instantly in a chaotic duel. Anime Rimuru is still learning, and Diablo is precisely the sort of opponent who could exploit a moment of uncertainty before a new ability is fully understood. This prevents the fight from becoming a lazy “four beats zero” argument.

How the fight could play out

The opening favors Diablo’s style more than people may expect. He would likely avoid a direct contest of magicule output and instead probe Rimuru with deception, ranged magic, and carefully chosen pressure. He knows Rimuru is dangerous; he would not walk into an absorption attempt just to prove a point.

Rimuru, meanwhile, would begin gathering information. Raphael would be central here. The longer Diablo shows his hand, the more material Rimuru has to analyze. Diablo may land meaningful attacks, force regeneration, or even push Rimuru into taking the duel seriously early on. That is why this is not a quick fight.

Once Rimuru shifts from reacting to actively limiting Diablo’s movement, the balance changes. Powerful barriers, control abilities, and the risk of Beelzebuth make Diablo’s room to maneuver smaller. At that stage, Diablo needs a clean, decisive finish before Rimuru’s adaptability closes the gap.

That finish is difficult to secure. Rimuru’s durability, recovery, defenses, and layered skills give him multiple ways to survive a bad moment. Diablo can create problems; he has a much harder time creating a permanent answer.

Raw power versus battle craft

This matchup is not really about whether Diablo is weak. He absolutely is not. In a purely technical contest—planning, intimidation, magic use, and exploiting an enemy’s habits—Diablo may even look sharper for stretches of the battle.

But a versus fight is not scored on style points. Rimuru’s anime version has the stronger overall foundation: higher demonstrated evolution, a broader defensive and offensive toolkit, and four Ultimate Skills that can cover each other’s weaknesses. Diablo’s experience makes the path difficult, not impossible.

Fans who enjoy Tempest’s power hierarchy may also want to compare how Rimuru stacks up outside his own series. Our Rimuru Tempest vs Anos Voldigoad breakdown looks at a very different kind of high-tier clash. For another battle where abilities and matchup conditions matter more than basic strength, see Goku vs Saitama: official and unofficial claims explained.

The fairest reading of Rimuru vs Diablo

Anime-only evidence favors Rimuru, but it does not support treating Diablo like a disposable obstacle. Diablo has the intelligence and magical sophistication to extend the fight, punish overconfidence, and force Rimuru to access the deeper parts of his kit. If the conditions gave Diablo prep time, an unfamiliar battlefield, or a reason to exploit Rimuru’s concern for allies, his chances would improve.

In a clean one-on-one battle with both characters serious and no outside interference, however, Rimuru has too much coverage. Diablo’s greatest strengths—his cunning, resilience, and mastery of demonic combat—keep the match competitive. Rimuru’s wider authority over the fight is what should decide it.