Arcane Vigor

2nd-Level Abjuration Spell (Sorcerer, Wizard)

Casting Time: Bonus Action
Range: Self
Components: V, S
Duration: Instantaneous

You tap into your life force to heal yourself. Roll one or two of your unexpended

Hit Point Dice, or Hit Dice for short, help determine a player character's Hit Point maximum, as explained in Creating a Character. Most monsters also have Hit Dice. A creature can spend Hit Dice during a Short Rest to regain Hit Points. See also Short Rest.

, and regain a number of

Hit Points (HP) are a measure of how difficult it is to kill or destroy a creature or an object. Damage reduces Hit Points, and healing restores them. You can't have more Hit Points than your Hit Point maximum, and you can't have less than 0. See also Breaking Objects and Damage and Healing.

equal to the roll's total plus your spellcasting ability modifier. Those dice are then expended.

At Higher Levels: The number of unexpended Hit Dice you can roll increases by one for each spell slot level above 2.

Source: Player's Handbook, p. 242