Roar
1st-level Enchantment
Casting Time: 1 bonus action
Range: Self (60-foot radius)
Components: V
Duration: 1 round
You give an echoing roar, filling your allies with courage and ferocity. Until the end of their next turn, creatures of your choice within 60 feet that can hear you are bolstered by your ferocity. Whenever these creatures make an attack, the target adds a +1 to attack and damage rolls.
This spell can be cast while wildshaped, polymorphed or transformed, as long as your form has a mouth.
At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the bonus to attack and damage rolls increases by 1 for every two slot levels above 1st.
Source: Homebrew