Healing

Healer's Kit Dependency

A character can't spend any Hit Dice after finishing a short rest until someone expends one use of a healer's kit to bandage and treat the character's wounds.

Slow Natural Healing

Characters don't regain hit points at the end of a long rest. Instead, a character can spend Hit Dice to heal at the end of a long rest, just as with a short rest.
This optional rule prolongs the amount of time that characters need to recover from their wounds without the benefits of magical healing and works well for grittier, more realistic campaigns.