Feats

Zhentarim Tactics

Prerequisite
Level 4+, Zhentarim Ruffian
Ability Score Increase
+1 Dexterity or Charisma
Source
FRHoF

You gain the following benefits.

Retaliate

Immediately after a creature within 5 feet of you hits you with a melee attack, you can make an Opportunity Attack against that creature.

Versatile Merc

When you finish a Long Rest, choose a skill in which you have proficiency. You have Expertise in that skill until you finish your next Long Rest.