'Ere We Go

As the caster chants and dances about, they leak fighty-energy, boosting the fierceness and power of friendly creatures nearby. Friendly creatures that can hear or see the caster have their move speed increased by 10 feet and add 1d4 damage to each damage roll while the caster maintains concentration.

Casting this spell at higher levels effect the additional damage as follows:
3rd level: 1d6, 4th level: 1d8, 5th level: 2d4, 6th level: 1d10, 7th level: 1d12, 8th level: 2d6, 9th level: 2d8