The ready action 5e exists for one reason: a character wants to act later, in response to something specific, instead of right now. Used well, it creates clean tactical moments. Used loosely, it turns initiative into a negotiation.
What the Ready Action Does (and Costs)
On a turn, a creature can take the Ready action to prepare a reaction. That reaction happens after a chosen trigger, before the creature’s next turn.
The cost is real. The creature spends its action now, and it spends its reaction later. If the trigger never happens, the action is lost and the reaction is still available for other things.
Example: A fighter in a 10-foot-wide corridor says, “I ready a shove if the ogre steps into the doorway.” The fighter’s action is spent on Ready. If the ogre never approaches the doorway, nothing happens and the fighter does not get that action back.
Step-By-Step: Declare Trigger, Declare Reaction, Then Wait
The ready action 5e runs fast when it is treated like a three-part statement.
Step 1: Choose a Clear Trigger
A trigger must be observable and specific. “When the cultist opens the chest” is clear. “When things go bad” is not.
A good trigger answers two questions: what event, and where.
Example: A ranger on a balcony says, “If the bugbear comes out of the north door, I shoot it.” The north door anchors the trigger, and “comes out” is a visible event.
Step 2: Define the Reaction You Will Take
The reaction is either one action (like Attack, Dash, Disengage, Hide, Use an Object) or movement up to the creature’s speed. It is not both.
Example: A rogue says, “When the guard looks away, I move 30 feet to the stairs.” That is a readied movement reaction. The rogue is not also taking the Hide action as part of that reaction.
Step 3: If the Trigger Never Occurs, Nothing Happens
If the trigger does not happen before the creature’s next turn, the readied action fizzles. The creature still has its reaction available for something else, such as an opportunity attack.
Example: A cleric readies “cast guiding bolt when the ghoul stands up.” The ghoul stays prone and crawls away. The spell is not cast, and the cleric’s action is gone.
Triggers That Keep Combat Moving
Most slowdowns come from triggers that require interpretation mid-round. A fast trigger is binary.
Good: “When the hobgoblin steps into the room.”
Slow: “When the hobgoblin looks like it’s going to attack.”
Good: “When the wizard starts casting a spell.”
Slow: “When the wizard does something suspicious.”
Example: A paladin wants to protect the back line. “If any enemy enters within 5 feet of the sorcerer, I attack that enemy.” That resolves instantly when a miniature crosses a line.
Common Pitfalls (and the Fast Fix)
Vague Triggers
Vague triggers invite table debate. The fix is to force a trigger to point at a single event.
Example fix: Replace “when the assassin reveals themselves” with “when the hooded figure draws a weapon.”
Trying to Ready Extra Movement or Multiple Actions
The ready action 5e does not store a whole turn. A creature cannot ready “move behind the pillar and attack” unless the reaction is only one of those pieces.
Example: A barbarian says, “When the door opens, I run in and hit the first thing I see.” Clean version: “When the door opens, I move up to my speed into the room.” Or: “When an enemy becomes visible through the doorway, I attack it.”
Holding Spells, Concentration, and Timing
A readied spell is special. The caster casts the spell on their turn, holds its energy, and then releases it as a reaction when the trigger occurs.
Two consequences matter at the table.
First, the caster must concentrate while holding the spell, even if the spell normally does not require concentration. Taking damage can break that concentration and waste the spell.
Second, if the trigger never happens before the caster’s next turn, the spell slot is spent anyway.
Example: A wizard readies web with “when the gnolls bunch up in the choke point.” An arrow hits the wizard for 7 damage. A failed concentration save drops the held web, and the slot is gone.
Readied Attacks vs. Opportunity Attacks
Opportunity attacks are a separate reaction triggered by an enemy leaving reach. A readied attack is a reaction triggered by whatever was declared.
A creature only gets one reaction per round. Choosing to ready an attack often means giving up the chance to take an opportunity attack.
Example: A polearm fighter readies “attack the wight when it steps within 10 feet.” The wight instead runs past and leaves reach. The fighter cannot take an opportunity attack because the reaction is already committed to the readied attack.
How Ready Interacts with Initiative Order
Ready does not change initiative. The creature still takes its turn on its original count, even if the reaction fires later.
That matters for effects that care about “until the start of your next turn” or “until the end of your next turn,” and it matters for planning.
Example: A monk on initiative 16 readies “stun the ogre when it climbs the ladder.” The ogre climbs on initiative 12, and the monk spends the reaction then. On the monk’s next turn at 16, the monk still acts normally, but the reaction is already spent for the round.
Quick Examples for Melee, Ranged, and Spellcasters
A ready action 5e call should fit in one breath.
Melee example: “If the skeleton steps onto the bridge, I shove it.”
Ranged example: “If the cultist peeks from behind the statue, I shoot.”
Spellcaster example: “If the troll regenerates and stands, I release fire bolt.”
Each trigger is visible, each reaction is one action, and each one avoids guessing about intent.
DM Checklist: Adjudicate Triggers Consistently and Keep Turns Fast
A DM does not need to police creativity, but a DM does need to keep triggers crisp.
When a player declares Ready, run this quick check.
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Is the trigger observable on the battlefield, not a guess about motives?
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Can everyone tell when it happens without discussion?
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Is the reaction exactly one action or movement, not a bundle?
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If it is a spell, did the player accept concentration and the risk of losing the slot?
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Does the player understand that the reaction is spent, so opportunity attacks may be off the table?
Example ruling: A player says, “I ready to counterspell if the enemy mage casts something big.” The DM asks for a specific trigger: “Name the trigger as ‘when the mage casts a spell’ and you can choose to counterspell then, or pick a specific spell you are watching for if you have a tell.” The table moves on.
FAQ
What Happens If the Trigger Never Occurs for the Ready Action 5e?
The readied reaction does not happen, and the action spent to Ready is lost. The creature still has its reaction available for other triggers until it uses it.
Can a Character Ready Movement and an Attack in 5e?
No. The reaction from Ready is either movement up to speed or one action. If a character wants both, the character must choose one piece to ready.
Does a Readied Spell Use the Spell Slot If It Never Goes Off?
Yes. In the ready action 5e rules for spellcasting, the spell is cast on the caster’s turn and held with concentration. If the trigger does not happen by the caster’s next turn, the slot is still spent.
Does Ready Change Initiative?
No. The creature keeps its initiative count. The reaction can occur later in the round, but the creature’s next turn still happens on its original initiative.
Can a Creature Take an Opportunity Attack If It Readied an Action?
Only if it still has its reaction. Since Ready uses the reaction when it fires, a creature that already spent its reaction cannot also make an opportunity attack that round.
