You’ve developed expertise in fighting with a whip or chain. You gain the following benefits:

• When you wield a whip or a chain, you can try to disarm or grapple the target when it is large or smaller. Your attack roll must be higher than the targets' athletics or acrobatics check.   
• When you make a successful attack against the ankle of a bipedal (or monopedal) target, you can try to knock it prone ("shoving a creature", PHB 195p).  

• The whip or chain gains the Versatile property and the damage dice increases to a 1d6 when used with two hands. 

• You can try to grapple and move an object towards you within the range of your weapon. You must succeed on an attack role and the object can not be heavier than your Dexterity modifier in pounds.