Flash Fiction #314: Myth of the Rainbow (Drabble)

Tiny pixies once ruled the sky, darting everywhere with flashes of bright color, pleasing all who saw them -- except for the orcs who hated and envied their beauty.  The orcs drove them into caverns and wells, using dark magic to trap them away from the sky.
Ors also hate rain.  When it falls they hide and their spells weaken.  Storms are dangerous for pixies, though, so they can only take