# Keen Mind *Source: Player's Handbook (2024) p. 205* **Prerequisite**: 4th; Intelligence 13 or higher You gain the following benefits. **Ability Score Increase.** Increase your Intelligence score by 1, to a maximum of 20. **Lore Knowledge.** Choose one of the following skills: [Arcana](/Rules/Source/skills.md#Arcana), [History](/Rules/Source/skills.md#History), [Investigation](/Rules/Source/skills.md#Investigation), [Nature](/Rules/Source/skills.md#Nature), or [Religion](/Rules/Source/skills.md#Religion). If you lack proficiency in the chosen skill, you gain proficiency in it, and if you already have proficiency in it, you gain [Expertise](/Rules/Source/variant-rules/expertise-xphb.md) in it. **Quick Study.** You can take the [Study](/Rules/Source/actions.md#Study) action as a [Bonus Action](/Rules/Source/variant-rules/bonus-action-xphb.md).