D&D 5e · Actions
You decide what perceivable circumstance will trigger your reaction. Then you choose the action you will take in response. When the trigger occurs, you can take your reaction right after the trigger finishes or ignore the trigger. If you readied a spell, it must be Concentration.
Systems Reference Document 5.1 (2016), © 2016 Wizards of the Coast LLC. CC BY 4.0.
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