Player > Ancestry > Gnome > Feats > Theoretical Acumen

Theoretical Acumen [free-action]FEAT 1

Lost Omens Character Guide p.32

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GNOME

Frequency once per day
Trigger You succeed at a skill check to Recall Knowledge to identify a creature.

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You study a creature’s form and behavior to hypothesize likely means of overcoming its strengths. Once before the end of your next turn, you can use the skill modifier from the triggering check in place of your saving throw modifier against one of the creature’s abilities, in place of your Perception modifier to Seek the creature, in place of your Deception modifier to Feint against the creature, or in place of your Intimidation modifier to Demoralize the creature. Alternatively, against one of the creature’s attacks, you can use your DC for the skill used in the triggering check in place of your AC.