Mystic Arts
From Final Fantasy Wiki
Mystic Arts, also known as Yin and Yang, is a command ability from Final Fantasy Tactics. It is used by the Mystic. Mystic Arts consists of negative status effects, as well as one or two positive buffs. It is one of the command abilities that can be used with the Arithmetician's Arithmeticks ability.
Beowulf Cadmus and his rival, Aliste Rosenheim, have a similar skill, known as Spellblade. It uses essentially all the same spells, but are far more effective and require a sword to be performed.
