General Feat (Prerequisite: Level 4+, Dexterity 13+)
You gain the following benefits
Fast hands. You can treat whips as light weapons.
Twin Lashes. While you are wielding a whip in each hand, and you hit a creature with one of them, you can use a bonus action to attempt to restrain the target with that whip.
The target must succeed on a Strength saving throw (DC = 8 + your proficiency bonus + your Dexterity modifier) or be restrained until the start of your next turn.

The effect ends early if you make an attack with the whip maintaining the restraint, if you stop holding the whip, or if you move out of that whip’s reach.

Once you successfully restrain a creature this way, you can’t use this feature again until the end of your next turn.