Sorcerous Vigor

Spellcaster Feat (Prerequisite: Charisma 13 or higher and the Sorcery Points class feature)

When your magical reserves are low, you can call on your lifeforce to fuel your magic.

• Increase your Charisma score by 1, to a maximum of 20.

• When you start your turn and have no sorcery points remaining, you can use a reaction to spend one Hit Die. Roll the die and add your Constitution modifier to it. You regain expended sorcery points equal to up to half the total (minimum of 1). You can never have more sorcery points than the maximum for your level. Hit Dice spent using this feat can’t be used to regain hit points during a short rest. You regain spent Hit Dice as normal.