Enemies have damage resistances and status ailment resistances.
They can be checked via Stage Info.
■ Damage Resistances
When resistance is low, damage from the relevant attack type increases, and ""WEAK"" appears above the damage amount.
When resistance is high, damage from the relevant attack type decreases, and ""RESIST"" appears above the damage amount, which is also dimmed.
■ Status Ailment Resistances
When resistance is low, the target becomes more susceptible to that status ailment.
When resistance is high, the target becomes less susceptible to that status ailment.