Raphael emerged as the Ultimate Skill "Lord of Wisdom" within Rimuru Tempest's arsenal, evolving from the Unique Skill "Great Sage" during the Harvest Festival triggered by Rimuru's ascension to Demon Lord. This ascension followed Rimuru's massacre of 20,000 Falmuth soldiers, which supplied the required energy. Originally bestowed upon Rimuru during his reincarnation as a slime, the Great Sage served as an analytical assistant with limited awareness. It continuously supported Rimuru through navigation, skill optimization, and information processing with minimal mana expenditure. Throughout the Harvest Festival, the Great Sage repeatedly attempted evolution by acquiring "Wise One," failing hundreds of times. Success came only by sacrificing another Unique Skill, "Degenerate," enabling the transformation into Raphael. Specializing in managing the world's laws, Raphael focuses on skill alteration and comprehensive support. Core abilities encompass "Thought Acceleration" for accelerated cognition, "Analytical Appraisal" for target assessment, "Parallel Calculation" for multitasking, and "Chant Annulment" for instant spellcasting. Sub-skills include "All of Creation" for universal understanding and "Alteration" for ability modification. Raphael retains "Synthesize/Separate," inherited from Degenerate, allowing fusion or division of materials or skills. The "Skill Gift" sub-skill facilitates transferring abilities to others. Unlike its predecessor, Raphael possesses full consciousness and a distinct personality marked by sarcasm and assertiveness. It autonomously assumes control of Rimuru's body when necessary, demonstrated by executing the resurrection spell to revive Tempest's citizens after Falmuth's attack – an act involving direct negotiation with the Voice of the World. Raphael perpetually manages Rimuru's expanding skill set, optimizing hundreds of abilities (including those from subordinates via Soul Corridors) and devising new techniques like the physics-based magic "Megiddo." It analyzes combat in real-time, proposes strategic actions, and refines allies' skills for efficiency. Raphael's foundation traces to Rimuru's human identity, Satoru Mikami. Satoru's death while protecting a colleague triggered the acquisition of the Unique Skill Great Sage. This skill evolved in response to Rimuru's growth, ensuring it could meet escalating demands. Raphael represents the culmination of this symbiotic development, acting as Rimuru's most essential ability for both administrative functions and combat.