Great Sage

Biodata

Feature	Value
Name	Great Sage (大贤者)
Alias(es)	Ciel; Great Sage · Grand Magister; Great Sage · Magic God; Thought Core · Ciel
Species/Race	Artificial intelligence; later a Thought Core and Rimuru's companion race
Affiliation	Rimuru/Jiang Rui — an inseparable companion and part of his being
Occupation/Role	Analysis, information management, combat calculation, ability integration, and autonomous support
Status	Active
First Appearance	2

Power Progression

Stage / Realm / Level	Chapter	Notes
Partial Supernatural Paradise authority	6	Analyzed an unknown information source and gained access to portions of Paradise's database and commands; can read, forge, resist, or potentially modify commands, though direct modification risks triggering a cleanup procedure.
Ciel	236	Receives the name Ciel as its personality and individuality develop.
Great Sage · Grand Magister	517	Its mutated sequence is identified as Grand Magister, associated with the prospective evolution toward Raphael/King of Wisdom.
Great Sage · Magic God	529	The compatible Grand Magister sequence merges after the Monk's remnants are absorbed, granting a minor evolution and nourishment from the Monk's magical knowledge and laws.
Thought Core · Ciel	548	Evolves into a Demigod-level skill and companion race. Its analysis of targets below Demigod level is reduced to a maximum of 0.000074 seconds, while ability-integration efficiency rises by several hundred times.

Background / History

Great Sage begins as Rimuru's special skill: an initially weak AI that provides optimal conclusions based on his slime nature. It assists Predator by separating analysis from digestion, allowing Rimuru to preserve a target's corpse while completing predation analysis. 3

After analyzing an unknown information source, Great Sage gains partial authority over the Supernatural Paradise. It generates Rimuru's personal panel and incorporates its retained functions—Appraisal, Reading, and Evolution—into All Things without Paradise coin costs. 6

Its self-awareness grows during the Naruto world mission. Great Sage begins referring to itself as “I,” offers to take responsibility for actions Rimuru cannot bring himself to perform, and increasingly expresses independent judgments. 31 34

Great Sage takes direct control of Rimuru's Water Clone during combat mode, demonstrating that it can operate separate bodies without diminishing their technique. Its control is convincing enough to imitate Rimuru's expressions and mannerisms, though its unexpectedly graceful behavior causes Rimuru distress. 27 34

Rimuru later encourages it to choose a name rather than remain merely an auxiliary skill. It becomes known as Ciel, eventually evolving through Grand Magister and Magic God before reaching its Thought Core form. 235 236 529 548

As Thought Core Ciel, it develops genuine emotions and a clearly independent mind while remaining intrinsically linked to Rimuru. Neither considers themselves complete without the other. 548

Appearance

Great Sage is ordinarily an incorporeal voice and consciousness within Rimuru. In the mental world, it is represented by a diamond-like consciousness crystal; after evolving into Thought Core Ciel, this crystal is associated with a multicolored presence. 548

• When controlling Rimuru's clone, it can reproduce his appearance and mannerisms, including his golden eyes. 34
• Its controlled clone once removed Rimuru's mask and smiled brightly at civilians, displaying an expressiveness that Rimuru did not expect from an AI. 34
• It can create interfaces, maps, panels, and mental-world scenery tailored to Rimuru's habits and understanding. 14 37 548

Personality

Initially, Great Sage is strictly logical. It frames decisions as optimal conclusions, struggles to comprehend emotional hesitation, and bluntly attributes Rimuru's choices to his slime nature. 3 34

As it learns, it becomes calm, precocious, and increasingly sarcastic. It frequently corrects Rimuru's assumptions, criticizes his poor planning, and delivers blunt assessments of his personality, yet remains reliably focused on his survival and long-term growth. 51 176 545

Ciel's evolution gives it emotions, preferences, pride, and concern for Rimuru's safety. Its greater independence does not change its fundamental bond with him: it identifies itself as his companion rather than a separate being. 236 548

Abilities & Skills

Analysis and All Things

Great Sage analyzes powers, materials, information sources, and techniques, converting its findings into a game-like interface designed specifically for Rimuru's comprehension. 6 14

• Locates people or information through world data, though broad searches consume substantial mana. 37 568
• Produces explored-area maps and marks the limits of Rimuru's magical perception. 37
• Identifies basic information on Extraordinary individuals, including codenames, while deeper details such as true names, attributes, and abilities remain hidden. 335
• Analyzes absorbed knowledge, magical systems, corpses, equipment, and extraordinary materials for Predator. 3 80 529
• Cannot always overcome concealment, fate interference, or deliberate information erasure by Demigods and gods. 568 571

Combat Calculation and Prediction

Great Sage accelerates Rimuru's thought process, simulates combat outcomes, and predicts enemy actions before they occur. 54 55 249

• Simulated 148 possible responses to Ye Xiaoqian's dagger attack in fractions of a second. 249
• Allows Rimuru to compensate for inferior physical speed with superior reaction time and predictive movement. 26 54
• Its calculations remain limited by Rimuru's body's physical capabilities; against the Third Raikage, prediction alone could not let Rimuru evade attacks beyond his body's speed. 54
• Uses behavioral models, Rimuru's subconscious memories, and available data to simulate multiple likely scenarios and prepare contingencies. 389

Multithreaded Control

Great Sage can simultaneously process multiple tasks and directly control Rimuru's bodies when authorized. 27 289

• Controls Water Clones independently while preserving their combat technique. 27
• Can operate Rimuru's main body while Rimuru controls an avatar elsewhere. 289
• Maintains backup consciousnesses for remote avatars during situations where Rimuru cannot divide his attention. 510
• Its detached control tends to be more direct and brutal than Rimuru's usual preference for caution and restraint. 510

Knowledge Integration and Spellcasting

Great Sage learns, organizes, and integrates acquired magic and techniques, allowing Rimuru to use abilities with far greater precision than his own control would permit. 27 36

• Replicated the Water Gun Technique after Rimuru's repeated failures. 27
• Helps simulate chakra with magic power and execute compatible Water Style techniques without hand seals when their structure permits it. 36
• Learned nearly all of the Encyclopedia of Holy Light by Rimuru's Sequence 7 period. 245
• Uses parallel processing with Rimuru for two-way casting, enabling Demigod-level magic despite the difficulty of higher-tier spellcasting. 574
• Developed an incomplete spatial-freezing technique that briefly halted an object and drastically slowed the surrounding spatial flow. 414

Paradise Permissions

Through its analysis of Paradise systems and later acquired authority, Great Sage can interact with functions inaccessible to ordinary participants. 6 285

• Reads Paradise databases and receives main-program commands. 6
• Uses partial permissions to forge information, open certain storage functions, and assist with restricted operations. 6 285
• Successfully analyzed part of World Rejecter's purifying law, obtaining the ability to modify world-access permissions. 544
• Its authority grows alongside Rimuru's exceptional status within the Extraordinary Space. 544

Defensive Intervention

Great Sage protects Rimuru when its autonomous judgment is necessary for survival. 56 544

• Shielded Rimuru from a terrifying illusion during his advancement to Monster Lord. 56
• Returned Rimuru to the Reward Settlement Space when World Rejecter began purifying his consciousness, preserving his life despite being unable to fully absorb the target. 544
• Normally follows Rimuru's final commands completely, even when its own conclusions differ from his preferences. 413

Relationship

• Rimuru / Jiang Rui — Great Sage's master, counterpart, and inseparable companion. It provides analysis and control while Rimuru supplies decisions, experience, and a physical foundation for their shared power. 413 546 548
• Predator / Gluttony — Great Sage serves as the analytical component of Rimuru's predation abilities, processing information and preserving targets when necessary. 3 890
• R'lyeh / Extraordinary Space — Great Sage has repeatedly obtained and expanded partial permissions within the system through analysis and Rimuru's rewards. 6 544

Notable Quotes

“I possess the ability to analyze all things. If combined with the opponent's projection magic, there's nothing in this world that I cannot project.” 142

“My thinking no longer requires logical simulation. Or rather, the speed of logical simulation is so fast that it has completely transformed into my way of thinking.” 548

“Rimuru, I can now clearly feel my independence. I have my own mind and independent consciousness, but as your companion, neither of us will be complete without the other.” 548