Opportunity Attack or Attack of Opportunity is a common Reaction. This ability allows a creature to make a melee 
Attack roll against enemies when they move out of the creature's melee range.
Description
Automatically attack an enemy moving out of your reach.
Properties
- Cost:
-
Reaction - Damage:
- Normal weapon damage
- Details:
-
Range: Normal weapon range
Notes
- The
Action allows creatures to avoid provoking opportunity attacks. - The
feat allows an opportunity attack when creatures walk into reach if using polearms. - Creatures cannot make opportunity attacks when:
- Wielding only ranged weapons.
- Having Conditions that prevent the use of Reactions, such as
, 
, or 
.