Healer

Source: Player's Handbook

You gain the following benefits.

Battle Medic
If you have a Healer's Kit, you can expend one use of it and tend to a creature within 5 feet of yourself as a Utilize action. That creature can expend one of its Hit Point Dice, and you then roll that die. The creature regains a number of Hit Points equal to the roll plus your Proficiency Bonus.

Healing Rerolls
Whenever you roll a die to determine the number of Hit Points you restore with a spell or with this feat's Battle Medic benefit, you can reroll the die if it rolls a 1, and you must use the new roll.