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Ending Concentration
Concentration can be willingly ended at any time (not action required)
Breaking Concentration
Casting another spell that requires concentration ends the effect of the original spell.
Taking damage requires a special CON save. The DC equals 10 or half the damage received, whichever is higher.
Being Incapacitated (Conditions) or killed ends a concentration spell.
An enormous distraction, such as a tidal wave crashing into you, requires a DC 10 CON save to maintain concentration.