Weapon Specialty is an attribute that allows a character to gain 20% more ATK from weapons of that type in a Weapon Grid. For example, a character gains an extra 20 ATK from a 100 ATK weapon matching their weapon specialty, making it effectively a 120 ATK weapon for that character. A character can have up to two weapon specialties. The Main Character's weapon specialty is based on their current class.
Certain Weapon Skills use weapon specialty as a requirement for special effects. Ultima Weapons and Hollowsky Weapons have a weapon skill that only affects characters with a specific weapon specialty.