
In the fifth edition of Dungeons and Dragons, players may need to make a concentration check to determine their character's ability to focus on a spell despite adverse conditions, such as taking damage or facing attacks from enemies. This is calculated by rolling a 20-sided die (1d20) and adding the Constitution saving throw modifier, which is listed on the character sheet. The DC (difficulty class) of a concentration check is either 10 or half of the total damage taken by the character, whichever is greater. Constitution saving throws are also required to maintain concentration when a character is incapacitated or killed.
| Characteristics | Values |
|---|---|
| What is concentration check? | It determines a character's ability to focus on their spell despite adverse conditions, including attacks from enemies. |
| When is a concentration check required? | When a character takes damage, dies, or is incapacitated. |
| What is the DC (difficulty class) of a concentration check? | 10 or half of the total damage the character takes, whichever is greater. |
| How to calculate concentration check? | 1d20 + your character's Constitution saving throw modifier. |
| What happens when concentration is broken? | The spell fails, but the character does not expend a spell slot. |
| What is the War Caster feat? | It grants advantage on all concentration checks whenever a character takes damage. |
| What is the Resilient (Constitution) feat? | It provides proficiency in a saving throw chosen by the wielder. Choosing Constitution will give a bonus to Constitution saving throws, including concentration saves. |
| What is the Artificer's Spell-Storing Item? | It can hold a 1st or 2nd-level spell. If the spell requires concentration, the user must concentrate on using it. It grants up to 4 charges that can be used to succeed in a Concentration save if the user fails. |
| Can Druids reactivate concentration spells after transforming? | Until they reach the 20th level and gain their Archdruid capstone feature, Druids cannot reactivate concentration spells cast before transforming. |
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What You'll Learn

Constitution saving throw
To calculate a concentration check, roll a d20 (20-sided die) and add your Constitution saving throw modifier, also known as your CON save modifier, which is listed on your character sheet. This modifier is based on your character's Constitution score, which can be found on the same sheet. If your character has proficiency in CON saves, you can also add your proficiency bonus to the roll. For example, if your character needs to succeed on a DC 18 concentration check and has a CON save modifier of +5, you would need to roll a 13 or higher on the d20 to succeed. If you roll a 15, your total score would be 20 (15 + 5), and you would succeed on the check.
It's important to note that concentration checks are different from other types of ability checks, such as Strength or Dexterity checks. While proficiency in a skill usually applies only to a specific type of ability check, there may be situations where your proficiency can be applied to a different type of check. For example, if your character needs to swim from an offshore island to the mainland, the DM might call for a Constitution check with an Athletics skill, allowing you to apply your proficiency in Athletics if you have it.
In addition, there are feats and abilities that can enhance your character's performance on concentration checks. For instance, the War Caster feat gives your character advantage on all concentration checks when they take damage, making it useful for spellcasting classes. The Resilient (Constitution) feat is another option, as it enhances your character's Constitution saving throw modifier.
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Concentration checks
When your Dungeon Master (DM) asks for a "concentration check," it's time to roll the dice and calculate your chances of keeping your spell active. The formula for a concentration check is simple: roll a 20-sided die (1d20) and add your Constitution saving throw modifier, also known as your CON save modifier. This modifier is listed on your character sheet and represents your character's natural ability to concentrate. The result of this roll, combined with your modifier, will determine whether you succeed or fail in maintaining concentration.
For example, let's say your character is a wizard who has cast a powerful spell and is now facing an enemy attack. The DM calls for a concentration check to see if you can keep your spell active. You roll a 15 on the d20 and add your CON save modifier of +3, resulting in a total score of 18. If the Difficulty Class (DC) of maintaining concentration is 15 or lower, you succeed in the check and your spell remains intact. However, if the DC is higher than 15, your concentration is broken, and the spell ends.
In conclusion, concentration checks are a crucial aspect of spellcasting in D&D 5th edition. They test your character's ability to focus on their spells despite challenging circumstances. By understanding the mechanics of concentration checks and utilizing relevant feats or abilities, players can improve their chances of maintaining concentration and casting their desired spells effectively.
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Calculating concentration
In Dungeons & Dragons (D&D) 5th edition, concentration checks are a type of Constitution saving throw. These checks determine a character's ability to focus on a spell despite adverse conditions, including attacks from enemies. They also measure a character's ability to maintain their spell.
To calculate a concentration check, the formula is as follows: 1d20 + your Constitution saving throw modifier. When your Dungeon Master (DM) asks for a "concentration check," roll a d20 (20-sided die) and add your Constitution saving throw modifier, also known as your CON save modifier, to the result. This modifier is listed on your Player Character's (PC's) character sheet.
For example, if your PC needs to succeed on a DC 18 concentration check, and their CON save modifier is +5, you would roll the d20 and add the modifier to the result. If you roll a 15 on the die, your total score would be 20, meaning you succeed on the check and maintain concentration.
The DC (difficulty class) of a concentration check is either 10 or half of the total damage your character takes, whichever value is greater. This means that if your character takes damage, you must make a Constitution saving throw to maintain concentration. 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.
There are also certain feats and abilities that can influence your character's concentration checks. For example, the War Caster feat grants advantage on all concentration checks when your PC takes damage, making it useful for spellcasting classes. The Resilient (Constitution) feat also improves your character's Constitution saving throws, including concentration saves.
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Maintaining concentration
There are several ways to improve your character's ability to maintain concentration. One option is to choose the War Caster feat, which grants advantage on all concentration checks whenever your character takes damage. This is especially useful for spellcasting classes that are likely to be attacked in close quarters, such as an Eldritch Knight fighter or a paladin. Another option is to choose the Resilient (Constitution) feat, which provides a bonus to Constitution saving throws, including concentration saves. Additionally, certain spells or abilities, such as Bladesong, can grant bonuses to Constitution saves to maintain concentration.
The environment and your character's condition can also impact their ability to maintain concentration. For example, the GM might require a DC 10 Constitution saving throw to maintain concentration in certain environmental phenomena, such as a wave crashing over your character's ship in a storm. Being blinded, charmed, deafened, or frightened does not automatically break concentration, but a DM may rule that a frightened character must make a Concentration check depending on the circumstances. If your character is incapacitated or killed, they will automatically lose concentration on any spells they were maintaining.
It's important to note that not all spells require concentration. Some spells, such as Bladesong, grant bonuses to Constitution saves, while others may have different requirements, such as requiring a certain amount of time to cast or needing to pick one or more targets. As a player, it's important to carefully read the description of each spell to understand its specific requirements and whether it requires concentration.
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Losing concentration
There are certain feats and abilities that can assist with maintaining concentration. For example, the War Caster feat grants advantage on all concentration checks when a character takes damage, making it easier for them to maintain concentration. The Resilient (Constitution) feat also improves a character's Constitution saving throws, making it more likely they will succeed in concentration checks. Additionally, certain spells, such as Bladesong, can provide bonuses to Constitution saves to maintain concentration.
The environment and certain spells can also impact concentration. For instance, a Dungeon Master (DM) may rule that a character must make a concentration check in response to specific environmental phenomena, such as a wave crashing over them while on a storm-tossed ship. Similarly, certain spells, like Charm Person and Geas, can be used to request that a character drop their concentration.
It is important to note that concentration is not an action; it is a state of focus that can be disrupted by various factors. When concentration is broken, any spell that requires concentration immediately ends, and if the character wishes to cast the spell again, they must start the casting process from the beginning.
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Frequently asked questions
Constitution concentration calculations are used to determine a character's ability to focus on their spell despite adverse conditions, such as taking damage or being attacked by enemies.
The formula for calculating concentration checks is 1d20 + your Constitution saving throw modifier.
You need to make a concentration check when your character takes damage, dies, or is incapacitated.
The DC of a concentration check is either 10 or half of the total damage your character takes, whichever value is greater.
Yes, there are a few ways to improve your chances of passing a concentration check. For example, the War Caster feat grants advantage on all concentration checks when your character takes damage. Additionally, certain spells or abilities, such as Bladesong, can provide bonuses to Constitution saving throws, making it easier to maintain concentration.

























