Vibrostaffs (also known as vibrostaves or vibro-staves) were vibroweapons that employed intense vibration to make their strikes more effective.
Vibrostaffs were blunt melee weapons that came in single and double-handed varieties, and were typically several meters long; the intense vibrations generated by the weapon made the blunt impact of the weapon much stronger than normal, allowing a skilled wielder to cause considerable damage to both armored and unarmored opponents.
Vibrostaffs were the predominant weapon of choice for Royal Guard trainees. Taking an idea from his deceased apprentice, Darth Maul, Emperor Palpatine had vibrostaffs crafted to equip his newly formed corps of Imperial Guards. Palpatine employed one of the greatest melee weapons designers in the galaxy, Kolvo Weapons Manufacturing, KWM as it was more commonly referred to, to produce a limited number of these weapons.
Once the order was completed, the manufacturing facilities were the subject of an assault by TIE/sa bombers, effectively destroying all blueprints and machinery capable of producing these unique weapons.
A Royal Guardsman trained in the martial art of Echani could wield these durable, lightweight weapons almost like a third limb in combat.