Resting In Combat:
Using your turn during combat, you may roll hit dice to recover HP. This takes up all available actions, bonus actions, and reactions for that turn. You may, however, use your movement. You may only use up 1/3 of your total hit die rounded down, if this equals less then 1, you may not use this action. If you have no remaining Hit Die, you may use your action to roll 2 more hit dice at the cost of accumulating an exhaustion point. You may only use this up to exhaustion level 3.
Arcane Charge (Rest Variant): Spellcasters may take a level of exhaustion to recover 1D4 spell slots, level 5 spells or lower.
Short and Long Rests
For a Short Rest, you may roll 1 hit dice for 1 minute of rest OR gain maximum hit dice value for 1 hour of rest. Exhaustion can not be recovered during a short rest. You may regain 1 spell slot per 4 hit dice spent.
Long Rests are 24 hours.
Interrupted rests result in half benefits.