Positive Energy Aura (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Concentration, up to 1 minute|
You project an aura of positive energy that makes healing more effective. Do not cast it while fighting trolls.
For the duration, if a creature within 30 feet of you regains hit points, they gain an additional hit points equal to 1d8 + your spellcasting ability modifier. The regained hit points must have been the result of an instantaneous effect (such as a spell, potion or regeneration; but not a long or short rest).
At Higher Levels. When you cast this spell using a spell slot of 5th or higher, the healing increases by 1d8 for each slot level above 4th.