Arcane Blood

Whether through birth, training, or devotion, magic burns in your blood. This trait allows you to sacrifice health for magical strength:

• As an action, you can roll a number of hit dice (up to your character level) in order to regain spell slots with a combined level equal to half of the amount of hit dice rolled. When you regain these spell slots, you also subtract the total of the rolled hit dice from your hit points.
• None of these spell slots can be of 6th level or higher, and you cannot regain more or higher level spell slots than you normally have access to.
• Once you use this action, you cannot use it again until you finish a long rest.