The Orc King: R. Salvatore

...the hooded man said again-or started to, until a flash otlightning shot through the camp and drove into a keg of warm ale beside him. As the keg exploded, liquid flying, a sheet of dissipating electricity stole the darkness from the growing twilight.
All six of the companions fell back, shielding their eyes. When they regained their sight, one and all saw the lone
figure of a lean dark elf standing atop one of their wagons.