The battle was swift and merciless - despite their size, the elementals weren't much of a challenge for the seasoned adventurers, and as the last one fell, the central vortex immediately collapsed in on itself, erupting into a towering, shimmering geyser of water and green energy, emitting a terrible keening wail, that draws in water for hundreds of feet around, including all of the swans. After about fifteen minutes, the geyser, energy, and all, suddenly collapse, water cascading down in a brief storm - and every single swan was clearly dead, upside-down in the water, glowing with a faint residue of that strange, green energy.