Combos are abilities in Final Fantasy Tactics Advance that allow party members to join in an combo. Combos are usable once the character has at least one Judge Point.
The initial attack has 100% accuracy and ignores Reaction Abilities. Other characters with a combo set may join in if they are within their range (some can join in up to five spaces away, or have to be right next to the victim).
Each joining unit has a specific range, accuracy, and % of damage added when adding to a combo. Combos with more range or damage added are usually less accurate.
If one or members successfully adds in, then an extra Judge Points further increase damage.
While powerful, combos can be difficult to learn. They are learned from Mythril Weapons-- which can only be found as rewards for defeating another clan or via trading from Nono's shop.