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Concentration
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.
Caster needs to focus on maintaining this spell. They can only cast 1 concentration spell at a time, and their concentration might be broken when they take damage.
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
Uninterrupted, concentration lasts for the spell's full duration.[note 1] Otherwise, concentration can be broken under the following circumstances:
- 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 concentration spell
- If a caster casts a spell that requires concentration while already concentrating on a spell, concentration on the first spell is broken, and its effects ended.
- 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 2] Note also that a roll of 1 on a concentration saving throw is a critical failure and always breaks concentration, regardless of whether your bonus would have exceeded the DC.
- Leaving the party
- Companions lose concentration when dismissed from the party.
- Conditions
- Some conditions also break concentration, without allowing a save:
- Anything in SG_Incapacitated
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 taking a long rests will end most spells, it also effectively breaks concentration.
- ↑ Since the save to maintain concentration is a Constitution saving throw, it benefits from proficiency with and advantage on Constitution saves.
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