Concentration

Some spells require you to maintain concentration in order to keep the magic active. If you lose concentration, the spell ends.

If a spell must be maintained with concentration, this should be noted in the spell's duration, and the spell specifies how long you can concentrate on it. You can end concentration at any time with no action required.

Normal activity like moving and attacking doesn't interfere with concentration.

The following can break concentration:

• Casting another spell that requires concentration. You lose concentration on a spell if you cast another spell that requires concentration. You can't concentrate on two spells at once.
• 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.
• Being incapacitated or killed. You lose concentration on a spell if you are incapacitated or if you die.

The GM might also decide that certain environmental situations, such as a wave crashing over you while you're on a storm-tossed ship, require you to succeed on a DC 10 Constitution saving throw to maintain concentration on a spell.