Violet Grip Invocation

As a bonus action, you can release inky tendrils from your tattoo that streak across the ground and attempt to ensnare a creature within 60 feet of you. The target must make a Dexterity saving throw against your warlock spell save DC. On a failed save you pull the creature 30 feet closer to you. If the target creature is within 30ft of you it is pulled to an unoccupied space within 5 feet of you. 

After which point the Inky Tendrils remain attached to the creature and on all future turns you may use a bonus action to pull the creature 30 feet closer. On the target creature's turn, it can use an action to make a Strength saving throw against your warlock spell save DC to attempt to escape from the inky tendrils. 

If the target creature ever succeeds in its saving throw or is farther than the spells range the inky tendrils return to your tattoo. 

Once you have used this feature, you cant use it again until you finish a short or long rest.