A vrock can dance and chant as a full-round action-at the end of 3 rounds, a crackling wave of energy explodes from the vrock, dealing 2d8 electricity damage to all creatures within 100 feet. A Breath save halves this damage. For each additional vrock that joins in the dance, the damage increases by and must be started anew if any of the participating vrocks is slain, stunned, or otherwise prevented from dancing.