As a reaction, which you use when you use an skill check using Intelligence to do one of the following:

• Recall knowledge
• Identify an alchemical concoction
• Identify a herb, poison, or potion
• Identify a concoction or spell
• Identify a magic or technological item
• Diagnose illness
• Understand the gist of a language
• Communicate in a language

You can recall natural memories and knowledge previously inaccessible to you. You can reroll the Intelligence check.