I've always wondered this, but reaction attacks such as those given by certain feats and classes, i.e.:
- Sentinel (Lets you attack an enemy as a reaction that attacks anybody that hurts your allies in range)
- Polearm Master (Lets you attack an enemy as a reaction when they come into your polearm's range)
- Mage Slayer (Lets you attack an enemy as a reaction that casts a spell)
These kinds of reaction attacks...
I don't think they're technically specified as the same as Opportunity Attacks, but I wanted to see what you guys thought. It matters specifically because in the feat Sentinel, it specifies that Opportunity Attacks turn the enemy's speed to 0 for the rest of the turn, but it also gives the ability to attack enemies that hurt your allies. I just wanted to know if these two abilities work collaboratively, or if they're kinda their own thing.
Note: I'm not going to tag this as Rules-as-Written because I want to see if anybody would argue that it should be a house rule that these should be allowed as Opportunity Attacks.