When a creature within 30 feet of you that you can see casts a power, they provoke an opportunity attack from you.
Disruption Mastery
No prerequisite
Fighting MasteryPlayer's Handbook
At a glance
- Benefits
- 3
Choose one from force- or tech-casting. You've mastered fighting and interfering with casters of the chosen type, confounding their concentration. You gain the following benefits:
Benefits
You have advantage on saving throws against powers cast by creatures you can see if you've dealt damage to them since the start of your last turn.
Whenever you force a creature to make a saving throw to maintain concentration, the DC for the saving throw increases by an amount equal to your proficiency bonus.