Once per turn when you hit a creature with a Melee weapon, you can use one of the following effects.
Flank
Your Cohort has Advantage on the next melee attack roll it makes against the target while you are within 5 feet of it before the end of your next turn.
Pocket Sand
The target has Disadvantage on its next attack roll before the end of your next turn.
Trip
The target has the Prone condition if it is Large or smaller.