Incite the terrain where each of your allies in range stands, swims, flies, or trudges, to explode in a torrent of elemental force dealing 1d6 of a type of damage determined by the DM appropriate to the terrain (rocks might bludgeon, swamp muck might be acidic, etc.) to creatures within 5' on a failed Dexterity save, or half that on a success.
Verbal Component:
Terminus Displodo