Ready Action in D&D 5e (Explained): Triggers, Reactions, and Spell Timing
1 April 2026
Sometimes the winning move isn’t on your initiative number, it’s right after the ogre steps through the doorway, right when the assassin draws, right before the ritual bar fills. Ready is how you say, “I’m skipping my normal timing to act on a perceivable trigger,” with one catch you should respect upfront: it spends your reaction when it fires.
If reactions still feel slippery, read how reactions work; if you’re worried about free melee swings, pair this with opportunity attacks.
How Ready works (clean rules path)
On your turn, you can take the Ready action so that you can act later using your reaction.
- Choose a trigger that is clear and perceivable (“if the hobgoblin steps into the hallway,” not “if something bad happens”).
- Choose the action you will take when that trigger occurs, or decide you’ll move up to your speed in response (the rules let you Ready movement in this packaged way).
- When the trigger happens, you can use your reaction to perform what you Readied.
- If the trigger never happens before your next turn starts, you lose the Readied action (you already spent your action setting it up).
Important: you get one reaction per round. If you Ready something, you might not also use that reaction window for another option later the same round.
Good triggers vs “I’m ready for anything”
Good triggers sound like cinematography:
- “If anyone crosses this threshold…”
- “If the caster begins chanting loudly enough I recognize as spellcasting…”
- “If our rogue shouts the signal word…”
Weak triggers invite slog:
- “If they do something suspicious”, too fuzzy; your DM can’t adjudicate fairly.
Collaborate with your DM before you Ready: ambiguity slows everyone down.
Readying spells: power with paperwork
If you Ready a spell with a casting time of 1 action, you cast it on your turn, hold its energy, expending spell slot and components now, and release it with your reaction when the trigger occurs, if it occurs within the next short window (spells you hold don’t linger forever; read the Ready rules text for spells carefully in your PHB).
Holding often requires concentration. Which means your held spell can collide with other concentration and exposes you to concentration saves if you take damage before release.
If that paragraph made you nervous, you’re ready for concentration.
FAQ (table-speed)
Can I Ready and still make an opportunity attack later?
Not in the same round if both need your reaction. If you use your reaction on the Readied action, it’s gone until your next turn refreshes it.
Do I lose the spell slot if I Ready a spell and never release it?
Typically yes. You cast it to hold it; if the trigger never happens before the spell dissipates per the Ready rules, the energy (and often the slot) is spent for little payoff.
Can I Ready a bonus action?
No, Ready specifies an action (see PHB). Features that use bonus actions have to happen on their normal schedule unless a specific feature grants an exception.
Is Ready always better than Dodge?
No. Sometimes surviving this round (Dodge) beats a conditional future swing.
Related actions once you’re comfy
Teamwork that doesn’t cost reactions the same way: Help. Movement survival kit: Dodge, Dash, Disengage.
Recommended gear
The right bits at the table—dice, a grid, a quick reference—can quietly save a session from friction. If you’re stocking up or replacing something worn smooth, a single search is often enough to find what fits your group.
Search Dungeons & Dragons on Amazon — opens a category search; pick what your table actually uses.