## Proficiency Proficiency measures the impact that training has on the creature's capabilities. This value is represented by a bonus called Proficiency Bonus. ### Proficiency Bonus All creatures have a Proficiency Bonus which can be thought of as a creature's growth over time with specific capabilities. Firstly, a Proficiency Bonus can never be added twice to a roll, though it can be occasionally multiplied or divided (doubled or halved, for example). Regardless, you'd never apply twice or half proficiency in a capability more than once—this bonus never stacks.