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Projectile Priority is a gameplay mechanic in Dissidia Final Fantasy NT. The essence of Priority is to enable stronger projectiles to disable weaker ones. They come in several tiers with the highest being HP Level Priority. These cannot be blocked with parries, and can only be blocked with guards if they are EX Skills. The priority list as follows.

Beyond this they split their attacks into lower priority ones, but this is a general baseline to follow when trying to break through someone's projectiles unless their unique EX such as Rinoa, Shantotto, Golbez, or Cloud of Darkness changes their priority for the better or the worse.

Source Priority
EX Skills HP Level
HP Attacks HP Level
Marksman High
Vanguard Medium
Assassin Low
Specialist Dependent
Character Priority
Onion Knight Marksman (Sage) Assassin (Ninja)
Bartz Klauser Low
Exdeath Vanguard
Kam'lanaut Vanguard
Vaan Low
Gabranth Low
Zenos Galvus Assassin (0-2 filled) Marksman (All 3 filled)
Ramza Beoulve Low (No Shout), Marksman (Shout)