Ability Checks: Advantage and Disadvantage. Here are some of the various reasons why advantage or disadvantage would apply to one or more types of ability checks. Not listed here are magic item and class feature effects.

Ability Check has Advantage

• Your ally takes the Help action

• You benefit from a spell

• You use a helpful tool

• GM discretion

• GM grants you inspiration

Ability Check has Disadvantage​

• Due to environmental conditions

• You suffer a debilitating condition

• You are encumbered (variant rule)

• GM discretion

• You lack armor proficiency