Death Step

You briefly vanish into the Shadowfell and reappear in an unoccupied space you can see within 30 feet.

Immediately after you disappear, each creature within 10 feet of the space you left must a Constitution saving throw against your Spell Save DC. On a failed save, a creature takes 2d10 necrotic damage and cannot take reactions until the end of its next turn. On a successful save, the creature takes half as much damage and suffers no other effects.