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A medieval fantasy-style square icon depicting an elegant upward improvement arrow, its sleek, green metal shaft rising triumphantly with a faint violet glow radiating from its edges, accompanied by subtle trails of sparkling magical essence dripping from the tip, symbolizing progress and enhancement. The arrow is engraved with angular runes pulsing with a soft, arcane violet light, evoking mastery and growth. In the background, a shadowy silhouette of a rising castle tower or a glowing forge fades into a dusty, twilight haze, capturing the essence of advancement and achievement. The art style is dynamic and detailed, with bold linework and a dramatic color palette (vibrant greens, deep purples, and hints of sandy beige). The square frame is bordered with weathered, iron-like metal carved with jagged, gladiatorial patterns, maintaining a martial and rugged atmosphere. The design is striking and evocative, perfect for a game UI.