Your patron grants you the ability to move between the boundaries of the planes. You can cast Misty Step without expending a spell slot a number of times equal to your Charisma modifier (minimum of once), and you regain all expended uses when you finish a Long Rest.
In addition, whenever you cast that spell, you can choose one of the following additional effects.
Refreshing Step
Immediately after you teleport, you or one creature you can see within 10 feet of yourself gains 1d10 Temporary Hit Points.
Taunting Step
Creatures within 5 feet of the space you left must succeed on a Wisdom saving throw against your spell save DC or have Disadvantage on attack rolls against creatures other than you until the start of your next turn.