The Grim Muscari has a curved, grey handle with a small, blue section near its base and a flat, khaki-colored pommel. The blade is thin and elegantly designed. The top of its main blade is smooth, blue, and curves downward slightly, while its underside is khaki-colored and ridged. Its back blade is comprised of four blue, thin blades that curve upward slightly. The shaft of the blade is mainly blue, but sports a small, khaki-colored spike decorating its base, and a ring of the same color going around its top.
"Muscari" is an odd genus of flowers commonly known as "grape hyacinths" because of their shape and color, often a deep blue. "Grim" can mean "gloomy", "sinister", or "rigid". The Western personification of death, the Grim Reaper, is frequently depicted carrying a scythe.
Grim Muscari has a ground combo that is similar to many of Marluxia's other scythes. It is a swing to the left, then right, and upward slash, and a slice down at the ground. The aerial combo consists of a swing to the left, then back to the right. Marluxia then continues the combo by tossing the scythe into the air, catching it, and doing a 360-degree slice.
| Aristocracy | Star Shell | Nightcloud | Snowslide | Hard Winter | Taboo Text | Crescent | Magma Ocean | Interlude | The Tower | Grim Muscari | Éruption | True Light's Flight|
Soul Eater | Mage's Staff | Knight's Shield | Kingdom Key D | Kingdom Key