# Skill Expert *Source: Player's Handbook (2024) p. 207* **Prerequisite**: 4th You gain the following benefits. **Ability Score Increase.** Increase one ability score of your choice by 1, to a maximum of 20. **Skill Proficiency.** You gain proficiency in one skill of your choice. **Expertise.** Choose one skill in which you have proficiency but lack [Expertise](/Rules/Source/variant-rules/expertise-xphb.md). You gain [Expertise](/Rules/Source/variant-rules/expertise-xphb.md) with that skill.