Prepared Ranger

Cantrips. You can prepare up to one cantrip of your choice from the Druid spell list. Whenever you gain a Ranger subclass feature, you prepare up to one additional cantrip of your choice from the Druid spell list. When you take a long rest, you can change the cantrips you have prepared.

Tricks and Traps. At level 3, once per round, when you hit your Hunter's Mark quarry, you can cast a cantrip. The target of the cantrip is either your quarry or yourself.

• If it requires an attack roll, it automatically succeeds.
• If it requires a saving throw, it automatically fails.
• If it requires concentration, it no longer requires concentration but only lasts until the end the end of your next turn
• If its effect changes at higher levels, it keeps its lowest level effect 

Hunter's Quarry. At level 10, when you can cast Hunter's Mark without concentrating. If you cast Hunter's Mark again, your previous Hunter's Mark ends early.

Back Up Plan. At level 13, when you fail a Concentration saving throw, you can use your reaction to reroll the save.