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Concentration is a special Resource used by certain Spells. A spell with the 
Concentration tag requires the caster to focus on that spell for its duration.
A caster may only maintain the effect of one Concentration spell at a time.
Losing Concentration
There are several ways to lose focus and drop the effects of a Concentration spell:
- Casting any other spell with the Concentration tag
- Becoming Incapacitated
- Being knocked Prone
- Being reduced to 0 hit points (Downed)
- Taking damage and failing the associated Concentration Saving Throw
Concentration Saving Throw
Taking damage while concentrating on a spell forces a Concentration Saving Throw, a special type of Constitution Saving Throw.
The Difficulty Class of this saving throw is:
Difficulty Class = (Damage Taken)/2 (Minimum Difficulty Class = 10)
If this saving throw succeeds, concentration is maintained. If it fails, concentration is lost and the spell's effect ends.