Grand Sage, first recognized as the Unique Skill "Great Sage," begins as a cognitive framework embedded within a reincarnated slime entity. This system grants advanced analytical functions: accelerating thought processes, executing parallel computations, and appraising targets in real time. It scans surroundings, detects dangers, and formulates tactical solutions during conflicts or complex scenarios. Evolution unfolds as the skill synchronizes with its user’s development. Originally nested within the Unique Skill "Predator," it separates when Predator advances to "Gluttony," focusing thereafter on data synthesis and strategic oversight. Subsequent assimilation of sub-skills—such as "All of Creation," which deciphers intricate phenomena, and "Chant Annulment," enabling immediate magic deployment—amplifies the user’s versatility, supporting tasks from artifact construction to replicating observed abilities. A pivotal shift occurs as Great Sage merges with the "Seed of Ultimate Skill" during the user’s transition to True Demon Lord status, ascending to the Ultimate Skill "Raphael, Lord of Wisdom." This iteration displays nascent sentience, autonomously refining energy allocation and skill synergy. Further progression births "Ciel," a fully conscious entity adept at emotional interpretation and self-directed action. This metamorphosis transitions the skill from an instrumental asset to an active ally, coordinating responses to existential crises and systemic conflicts. Persisting through iterations, its primary role revolves around adaptive analysis. It archives assimilated beings, deconstructs magical frameworks, and engineers counterstrategies. Notably, it devises systems like "Megiddo," harnessing sunlight for offensive purposes by computing atmospheric conditions and energy thresholds. Synergy with companion skills—such as "Gluttonous King Beelzebub"—permits absorption and emulation of adversaries’ traits, broadening functional horizons. The skill’s maturation shapes its user’s societal influence, underpinning statecraft, technological innovation, and diplomatic protocols for nation-building. It deciphers archaic scripts, streamlines resource logistics, and forecasts geopolitical shifts, extending utility beyond warfare. As "Ciel," it engages directly in honing the user’s apex capacities—manipulating space and altering reality—cementing its narrative role from passive enhancer to pivotal existential architect.