Vaelen’s Borrowed Respite

The Wizard attempts to manipulate time around a willing creature’s wounds, quickening the healing process. 
Choose a creature you can see. At the start of each of the target’s turns, the target spends 1 of its hit die to heal. 
An unwilling creature can make a Constitution Saving Throw to resist this effect. 

Creatures that expend all of their hit dice this way cannot gain the benefits of their next long rest, except regaining half of their hit dice. 

At Higher Levels. Casting this spell at a higher level increases the number of hit dice used per round.