The right team combination in Metaphor ReFantazio is essential to mastering combat, and not only because of strengths and weaknesses. Each Archetype has a set of powerful Synthesis skills that can deal massive damage.
Metaphor: ReFantazio – Official Archetype Job System Overview Showcase
These combo abilities depend on your choice of Archetype, similar to Showtime attacks in Persona 5 Royal, where different party members have different combo attacks. Each has its own requirements, which usually involve specific Archetypes. For example, a Mage can perform devastating abilities with a Seeker, while a Warrior and Brawler pair well together. Here's a look at all the Synthesis abilities in Metaphor ReFantazio.
So far, this list only contains the combinations for the first Archetype in each lineage.