Arashi-Kumori has been coated with a poison that can interfere with the body’s motor functions by targeting the muscles and nervous system. The affects can vary from the numbing, paralysis, or slowing of limbs to halting breathing and inducing seizures or sleep. The poison triggers on contact with the skin or bloodstream, with the most severe symptoms manifesting in the immediate area of the wound. Requires the "Poison Weapons Feat" on the Character Sheets to be effective in combat.

The actual metal from which the Arashi-Kumori was forged is a dark alloy which makes the blades non-reflective in any light. The center hilt of the weapon is wrapped in black leather to allow for a sure, steady grip at all times. Both edges of both blades are sharpened. It was designed by Rasilvenaira to fit perfectly in her frequent role of assassin allowing for quick, silent strikes that don't draw attention to the weapon by any stray flash of reflected light.