A Reaction is a special action taken in response to a trigger defined in the Reaction's description. You can take a Reaction on another creature's turn, and if you take it on your turn, you can do so even if you also take an action, a Bonus Action, or both. Once you take a Reaction, you can't take another one until the start of your next turn. The Opportunity Attack is a Reaction available to all creatures.
{
"name": "Reaction",
"page": 372,
"srd52": true,
"__prop": "variantrule",
"source": "XPHB",
"entries": [
"A Reaction is a special action taken in response to a trigger defined in the Reaction's description. You can take a Reaction on another creature's turn, and if you take it on your turn, you can do so even if you also take an action, a {@variantrule Bonus Action|XPHB}, or both. Once you take a Reaction, you can't take another one until the start of your next turn. The {@action Opportunity Attack|XPHB} is a Reaction available to all creatures."
],
"ruleType": "C",
"basicRules2024": true
}