Shadow Ball (Sor/Wiz 4, Destruction 4)

   A ball of pure darkness and energy shoots
forth from between the palms of your hands and travels in
a straight line going straight through the first five creatures
in its path, dealing each of them 2d6 damage. The shadow ball
is an automatic hit. The shadow ball dissipates after hitting
its fifth target or reaching the end of its range. Every creature
that the shadow ball hits must make a Fortitude save (spell
caster’s save DC against 4th level spells) or suffer an extra
1d8 cold damage.