Opportunist (5e Feat)
From D&D Wiki
Prerequisites: Intelligence 13 or higher
You are capable of exploiting situations on the field of battle, gaining the following benefits:
- Whenever a creature provokes an opportunity attack from you, you can make two weapon attacks against the target (instead of just one) as part of the same opportunity attack.
- Whenever a creature would make an opportunity attack against you, you can use your reaction to make a melee weapon attack against the attacking creature.
- Whenever you Ready an action, you gain advantage on the first attack roll or ability check that action allows or requires you to make.