Bullet of Damocles

You point at a creature, marking it. When you cast this spell and as a bonus action on each of your turns afterwards, you can roll a d6. On a roll of a 6, the marked creature takes 6d6 force damage as a magical bullet tears through it from an impossible angle, and this spell ends. If you use this bonus action 6 times, the damage automatically occurs without rolling the d6.

At Higher Levels. When cast with a spell slot of 2nd level or higher, this spell deals 2d6 additional damage for each level above 1st.