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Persistent Spell (Metamagic) Source Advanced Player's Guide pg. 167 You can modify a spell to become more tenacious when its targets resist its effect. Benefit: Whenever a creature targeted by a persistent spell or within its area succeeds on its saving throw against the spell, it must make another saving throw against the effect. If a creature fails this second saving throw, it suffers the full effects of the spell, as if it had failed its first saving throw. A persistent spell uses up a spell slot two levels higher than the spell’s actual level. Spells that do not require a saving throw to resist or lessen the spell’s effect do not benefit from this feat.

Persistent Spell (Metamagic)

Source Advanced Player's Guide pg. 167
You can modify a spell to become more tenacious when its targets resist its effect.

Benefit: Whenever a creature targeted by a persistent spell or within its area succeeds on its saving throw against the spell, it must make another saving throw against the effect. If a creature fails this second saving throw, it suffers the full effects of the spell, as if it had failed its first saving throw. A persistent spell uses up a spell slot two levels higher than the spell’s actual level. Spells that do not require a saving throw to resist or lessen the spell’s effect do not benefit from this feat.

Archives of Nethys

Persistent Spell (Metamagic)