pf2e.fyi
From Pathfinder Rage of Elements, which isn't enabled.

Metabolize Element

FEAT 8
ARCHETYPE
Activity reaction
Prerequisites Elementalist Dedication
Trigger You take damage from a foe's spell or magical ability with a trait of one of the elements in your elemental philosophy.

You rapidly metabolize the elemental particles in your opponent's spell to gain a boost of energy. You gain the Quickened condition until the end of your next turn. You can use the extra action only to Step or Stride.

Pathfinder Rage of ElementsOGL