From The Zeropedia
Weapons are your main means of offense against the creatures that await you in Phantasy Star Zero. Sure you can go into battle bare-handed to duke it out with the bad guys, but with the arsenal that lies at your fingertips, why rely only on your fists? In Phantasy Star Zero, weapons are categorized into three groups: melee, ranged and technique. Melee weapons are your heavy-hitters geared more toward Hunters. Ranged weapons include all types of guns and other ballistic artillery intended for Rangers. Finally, technique weaponry is ideal for Forces thanks to their ability to enhance the power of techniques.