Ability Score Improvement
From D&D 5e
Ability Score Improvement is a feature of every class.
When you reach a class level with this feature, you can increase one ability score of your choice by 2, or you can increase two ability scores of your choice by 1. As normal, you can’t increase an ability score above 20 using this feature.
Sources:
- Player’s Handbook, p. 49, 54, 59, 67, 72, 78, 85, 92, 96, 102, 108, 115
