Battery

Circle of destruction
Hammer comes crushing
Powerhouse of energy
Whipping up a fury
Dominating flurry
We create the battery

An intense spell, usable by only equally intense bards. A wild solo that can kick up all your allies into a blitz, making a potent force if the song can reach its conclusion.

At the start of the spell, choose any number of targets within range. For the duration of the spell, your movement speed is reduced to 10ft, and getting hit or taking any other actions will immediately cancel the effects of the spell.

For the spell's duration, each target gets a +10 to move speed, +4 to all attack roles, and attacks deal an additional 1d4 thunder damage. When the spell ends, if 3 turns passed, those targets instead get a +15 to move speed, +6 to all attack roles, and attacks deal an additional 2d4 thunder damage.