Final Fantasy IX

Sword Magic from Steiner, more specifically the ability to combine skills with party members to produce extra damage. In FFXI this could be considered the Skill Chain+Magic Burst, but I'd like this system in XIV to have more eye candy. Kind of like... how Double and Triple Techs worked in Chrono Trigger, special animation combo attacks between two or three classes.

Anyways, that's what I'd like to see.