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Concentration is a game mechanic used in spellcasting. Spells with the 
Concentration tag require the caster to continuously put focus into the spell in order to maintain its effects.
Overview
Most spells with a duration require the caster to concentrate to maintain the spell's effects for the full duration. These spells have the Concentration in their description. If concentration on a spell is broken, the spell's effects are ended immediately.
A caster can only concentrate on a single spell at a time, which is automatic and immediate – casters automatically begin concentrating on spells that require it.
Ending concentration
Although concentration normally lasts for a spell's full duration, or until another concentration spell is cast, there are multiple ways for concentration to break:
- Manually
- Concentration can be manually interrupted at any time via the x on the concentrated spell's icon, next to the caster's main portrait.
- Casting another spell
- Casting a second spell with the Concentration tag will break concentration.
- Long rests
- Taking a long rest ends concentration.
- Taking damage
- When a caster is concentrating on a spell and takes damage, they attempt a Constitution save against a DC equal to half the damage taken, or 10, whichever is higher. If the save fails, concentration ends.[note 1]
- Conditions
- Some conditions also break concentration, without allowing a save:
List of concentration spells
Cantrips
1st level spells
2nd level spells
3rd level spells
4th level spells
5th level spells
6th level spells
Footnotes
- ↑ Since the save to maintain concentration is a Constitution saving throw, it benefits from proficiency with and advantage on Constitution saves.