Discovered by Yuuno Scrya within ancient ruins, Raising Heart is an Intelligent Device with no prior registered users and an inactive artificial intelligence until acquired by Nanoha Takamachi. Yuuno served as a temporary guest user with limited access to functions like searching and sealing; full activation occurred only after Nanoha became its master. The device addresses Nanoha as "master," providing tactical assistance in magical combat through spell processing and firing control. Its origins remain undefined beyond the circumstances of discovery. Early translations romanized the name as "Raging Heart" due to variations in Japanese romanization systems, though official materials later confirmed "Raising Heart" as correct. The "Heart" component references an early design featuring a heart-shaped crystal, subsequently replaced by a red sphere. Following significant damage in a battle during the A's timeline, the device underwent an upgrade incorporating a Belkan cartridge system, leading to its redesignation as "Raising Heart Exelion." Nanoha typically continues using the original name. In the primary continuity, Raising Heart operates in multiple forms: Standby Mode is a dormant state appearing as a red spherical crystal approximately 1.5 cm in diameter, supporting auxiliary functions like image training. Device Mode manifests as a staff with a white-and-pink shaft and a red crystal suspended within a partial gold ring. Shooting Mode is optimized for bombardment spells, characterized by a squared head with two prongs. Sealing Mode features an extended head with energy wings, specialized for containment spells. Post-upgrade to Raising Heart Exelion, additional forms include Axel Mode (retaining Device Mode's appearance with added cartridge slots), Buster Mode (an enhanced Shooting Mode), Exelion Mode (a high-output spearhead form with mana wings), and later Exceed Mode and Blaster Mode (the latter deploying drone-like "Blaster Bits"). By *Force*, the device adapts Standalone Flight Mode, functioning autonomously as a floating weapon or shield to accommodate Nanoha's use of two-handed artillery. Within the movie continuity (*The MOVIE 1st* and subsequent films), the device's forms undergo redesigns: Device Mode incorporates blue and white accents. Shooting Mode and Sealing Mode are consolidated into Canon Mode, featuring a 180-degree rotatable trigger unit. Buster Mode is reimagined as Bustercanon Mode. Exelion Mode is later refined into Exelion II Mode. New exclusive film forms include Fortress Mode (integration with Nanoha's Barrier Jacket for armament control) and Formula Mode (a further enhancement via nanomachine integration). These adaptations streamline functionality, presenting pre-installed forms rather than user-developed configurations. Functional upgrades across media include the Accelerate Charge System for spell acceleration, the Cartridge System for amplified attacks via magic-propellant rounds, and the Blaster System for power amplification at the cost of user strain. The device consistently demonstrates adaptability, evolving to meet combat demands while maintaining its core role as a tactical assistant in magical operations.