Regeneration (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||concentration, up to 1 minute|
Choose one creature that you can see within range. For the duration of the spell, that creature is infused with positive energy, regaining 10 hit points at the start of each of its turns. If the creature takes acid or fire damage, it doesn't regain hit points until the start of its next turn.
At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the amount of hit points the target regains at the start of each of its turns increases to 15.