Hit Dice (HD) represent your ability to quickly recuperate from minor injuries and are spent to regain HP. Heroes start with a max of 1 Hit Die at level 1, and this limit increases by 1 each time they level up. Hit Dice are recovered during a Safe Rest.
Hit Dice
Core Rules v2 p. 9
Related Rules
4Field RestsAdventuring / Rest & Recovery
Leveling UpCharacters & Equipment / Creating & Advancing a Hero
Safe RestsAdventuring / Rest & Recovery
The Character SheetCharacters & Equipment / Creating & Advancing a Hero