Concentration
Concentration effects require the character to concentrate to activate, dismiss, or sustain them. If a concentration action is interrupted (such as by a reactive attack) or if the user is suffering from ongoing negative effects that damage them or hurt their concentration, they must make a Constitution saving throw against the effect's difficulty rating or DR 10 + half damage taken (whichever is higher) or fail to activate, dismiss, or sustain the effect. If multiple effects interrupt or multiple ongoing effects apply, roll against each separately in chronological order. If the effect is a mental or spirit effect, roll a Charisma saving throw instead.