UA Hunter's Mark

You are adept at focusing your ire on a single foe. You always have the Hunter’s Mark Spell prepared, and it doesn’t count against the number of Spells you can prepare. Moreover, you don’t have to concentrate on the Spell once you cast it; it lasts for its full duration, until you end it as a Bonus Action, or until you are Incapacitated.

18TH LEVEL: FOE SLAYER
Your Hunter’s Mark now deals an extra 1d10 damage to its target, rather than an extra 1d6.