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If I readied a spell with the trigger "When I take damage", do I have to make a constitution saving throw to avoid losing Concentration?

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If I readied a spell with the trigger “When I take damage”, do I have to make a constitution saving throw to avoid losing Concentration?

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3

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Suppose I was playing a wizard. I say to my DM, "I ready my Magic Missle. I cast it when I take damage, at the attacker." When the time comes, do I need to make a constitution saving throw immediately before I cast to avoid losing concentration?

dnd-5e spells readied-action

share|improve this question

asked 47 mins ago

MrHiTechMrHiTech

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$endgroup$

add a comment | 

3

$begingroup$

Suppose I was playing a wizard. I say to my DM, "I ready my Magic Missle. I cast it when I take damage, at the attacker." When the time comes, do I need to make a constitution saving throw immediately before I cast to avoid losing concentration?

dnd-5e spells readied-action

share|improve this question

asked 47 mins ago

MrHiTechMrHiTech

1,001324

$endgroup$

add a comment | 

$begingroup$

Suppose I was playing a wizard. I say to my DM, "I ready my Magic Missle. I cast it when I take damage, at the attacker." When the time comes, do I need to make a constitution saving throw immediately before I cast to avoid losing concentration?

dnd-5e spells readied-action

share|improve this question

asked 47 mins ago

MrHiTechMrHiTech

1,001324

$endgroup$

share|improve this question

asked 47 mins ago

MrHiTechMrHiTech

1,001324

share|improve this question

asked 47 mins ago

MrHiTechMrHiTech

1,001324

asked 47 mins ago

MrHiTechMrHiTech

1,001324

asked 47 mins ago

MrHiTechMrHiTech

1,001324

1 Answer
1

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9

$begingroup$

Yes, you do

The Readied action doesn't trigger until after your trigger completes:

When the trigger occurs, you can either take your reaction right after the trigger finishes or ignore the trigger.

When you ready a spell, you are concentrating on that spell as you hold it (PHB, 193)

When you ready a spell, you cast it as normal but hold its energy, which you release with your reaction when the trigger occurs. To be readied, a spell must have a casting time of 1 action, and holding onto the spell’s magic requires concentration (explained in chapter 10). If your concentration is broken, the spell dissipates without taking effect.

Since your trigger is when I take damage and you are concentrating, you will have to make a concentration save per the rules on concentration:

Taking damage. Whenever you take damage while you are concentrating on a spell, you must make a Constitution saving throw to maintain your concentration. The DC equals 10 or half the damage you take, whichever number is higher. If you take damage from multiple sources, such as an arrow and a dragon's breath, you make a separate saving throw for each source of damage.

If you fail, then you've lost your spell

Just to close the loop, if you do fail that concentration save, then you drop the readied spell and you won't be casting it.

share|improve this answer

edited 3 mins ago

Slagmoth

18.4k15598

answered 34 mins ago

NautArchNautArch

63.9k10232424

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  can you use "when an attacker aims at me" as a trigger instead?
  $endgroup$
  – PixelMaster
  7 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @PixelMaster I think it's been asked.
  $endgroup$
  – NautArch
  1 min ago
  
  

  
  
  
  

add a comment | 

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9

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Yes, you do

The Readied action doesn't trigger until after your trigger completes:

When the trigger occurs, you can either take your reaction right after the trigger finishes or ignore the trigger.

When you ready a spell, you are concentrating on that spell as you hold it (PHB, 193)

When you ready a spell, you cast it as normal but hold its energy, which you release with your reaction when the trigger occurs. To be readied, a spell must have a casting time of 1 action, and holding onto the spell’s magic requires concentration (explained in chapter 10). If your concentration is broken, the spell dissipates without taking effect.

Since your trigger is when I take damage and you are concentrating, you will have to make a concentration save per the rules on concentration:

Taking damage. Whenever you take damage while you are concentrating on a spell, you must make a Constitution saving throw to maintain your concentration. The DC equals 10 or half the damage you take, whichever number is higher. If you take damage from multiple sources, such as an arrow and a dragon's breath, you make a separate saving throw for each source of damage.

If you fail, then you've lost your spell

Just to close the loop, if you do fail that concentration save, then you drop the readied spell and you won't be casting it.

share|improve this answer

edited 3 mins ago

Slagmoth

18.4k15598

answered 34 mins ago

NautArchNautArch

63.9k10232424

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  can you use "when an attacker aims at me" as a trigger instead?
  $endgroup$
  – PixelMaster
  7 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @PixelMaster I think it's been asked.
  $endgroup$
  – NautArch
  1 min ago
  
  

  
  
  
  

add a comment | 

9

$begingroup$

Yes, you do

The Readied action doesn't trigger until after your trigger completes:

When the trigger occurs, you can either take your reaction right after the trigger finishes or ignore the trigger.

When you ready a spell, you are concentrating on that spell as you hold it (PHB, 193)

When you ready a spell, you cast it as normal but hold its energy, which you release with your reaction when the trigger occurs. To be readied, a spell must have a casting time of 1 action, and holding onto the spell’s magic requires concentration (explained in chapter 10). If your concentration is broken, the spell dissipates without taking effect.

Since your trigger is when I take damage and you are concentrating, you will have to make a concentration save per the rules on concentration:

Taking damage. Whenever you take damage while you are concentrating on a spell, you must make a Constitution saving throw to maintain your concentration. The DC equals 10 or half the damage you take, whichever number is higher. If you take damage from multiple sources, such as an arrow and a dragon's breath, you make a separate saving throw for each source of damage.

If you fail, then you've lost your spell

Just to close the loop, if you do fail that concentration save, then you drop the readied spell and you won't be casting it.

share|improve this answer

edited 3 mins ago

Slagmoth

18.4k15598

answered 34 mins ago

NautArchNautArch

63.9k10232424

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  can you use "when an attacker aims at me" as a trigger instead?
  $endgroup$
  – PixelMaster
  7 mins ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @PixelMaster I think it's been asked.
  $endgroup$
  – NautArch
  1 min ago
  
  

  
  
  
  

add a comment | 

$begingroup$

Yes, you do

The Readied action doesn't trigger until after your trigger completes:

When the trigger occurs, you can either take your reaction right after the trigger finishes or ignore the trigger.

When you ready a spell, you are concentrating on that spell as you hold it (PHB, 193)

When you ready a spell, you cast it as normal but hold its energy, which you release with your reaction when the trigger occurs. To be readied, a spell must have a casting time of 1 action, and holding onto the spell’s magic requires concentration (explained in chapter 10). If your concentration is broken, the spell dissipates without taking effect.

Since your trigger is when I take damage and you are concentrating, you will have to make a concentration save per the rules on concentration:

Taking damage. Whenever you take damage while you are concentrating on a spell, you must make a Constitution saving throw to maintain your concentration. The DC equals 10 or half the damage you take, whichever number is higher. If you take damage from multiple sources, such as an arrow and a dragon's breath, you make a separate saving throw for each source of damage.

If you fail, then you've lost your spell

Just to close the loop, if you do fail that concentration save, then you drop the readied spell and you won't be casting it.

share|improve this answer

edited 3 mins ago

Slagmoth

18.4k15598

answered 34 mins ago

NautArchNautArch

63.9k10232424

$endgroup$

share|improve this answer

edited 3 mins ago

Slagmoth

18.4k15598

answered 34 mins ago

NautArchNautArch

63.9k10232424

edited 3 mins ago

Slagmoth

18.4k15598

edited 3 mins ago

Slagmoth

18.4k15598

answered 34 mins ago

NautArchNautArch

63.9k10232424

answered 34 mins ago

NautArchNautArch

63.9k10232424