Magic Fang, Greater (5e Spell)
From D&D Wiki
|Casting time:||1 action|
You touch a creature to enhance its natural weaponry. Whenever the target makes an attack or damage roll with an unarmed strike, the target can roll a d8 and add the result to its roll. Alternatively, the target can attack with a melee weapon that is part of its body and still receive this benefit. If the target is affected by another spell or magical effect which grants a damage bonus to rolls, such as bless, it cannot also use the benefit of this spell.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature for each slot level above 3rd.