Saber Alter, formally designated Artoria Pendragon Alter, emerges as a corrupted incarnation of King Arthur reshaped by the Holy Grail's tainted mud. This transformation reverses her moral compass while intensifying despotic inclinations, yet preserves the bedrock principles beneath her altered psyche. Originally summoned as Saber in the Fifth Holy Grail War, her darkened form materializes in the Heaven's Feel timeline through Sakura Matou’s connection to the Shadow, channeling its influence as her Master. Her visage mirrors this corruption—alabaster skin, emerald eyes transmuted to molten gold, and obsidian armor reforged for augmented protection. The legendary Excalibur warps into Excalibur Morgan, its blade coursing with malevolent energy. Though tyranny defines her demeanor, flickers of her regal past linger through unyielding dedication to duty and sporadic glimpses of kinship with allies. She rationalizes ruthlessness as pragmatic necessity for enforcing order, her methodology diverging sharply from the noble monarch she once embodied. Within Heaven's Feel, Saber Alter ascends as a relentless adversary, her combat prowess amplified by Sakura’s boundless mana reserves. This arc culminates in her defeat during an exhaustive clash against Shirou Emiya and Rider. Beyond this timeline, iterations like her Fate/Grand Order portrayal exist unbound by the Grail's curse, operating autonomously as a Servant liberated from prior constraints. Interpersonal dynamics reflect her warped nature: a begrudging acknowledgment of Morgan’s superior rulership, sardonic amusement toward Agravain’s unwavering loyalty, and a contentious yet dismissive rapport with Jeanne d’Arc Alter that stops short of open enmity. Notably, her culinary tastes invert—junk food supplants aristocratic fare, a quirk stemming from her tainted Magic Core and reductionist outlook. This incarnation probes latent facets of Artoria’s psyche, positing her despotic streak as a warped reflection of the “ideal sovereign” she once pursued. Though living Artoria suppressed such impulses, the Grail’s corruption weaponizes these buried instincts, forging a ruler who wields absolute dominion yet faintly echoes the virtues she once championed.