Replace the rod of striking with the iron rod.

In practice, nobody is interested in using a melee weapon that you need
to train Evocations for, so let's do something more interesting.

The iron rod has Scattershot, a level 6 Conjuration/Earth spell that
blasts the area in front of the player in a shotgun-like spread of
metal fragments.

In practice it throws ~eleven BEAM_FRAG projectiles each of which does
roughly half the damage of an iron shot; thus it is quite powerful at
close ranges against lightly armoured targets and disperses crowds
quite readily, but is fairly wimpy at long ranges and against heavily
armoured targets.

Range is six squares - one more than Iron Shot. Don't expect for it to
do much at that distance, though.

SPELL_MELEE is gone, as it's now completely useless.

Credit to mumra for the name and the original concept for this (which is
still floating around on an old branch, in fact).

Spread and pellet count of Scattershot increases with spellpower.

At high power, you may think of it as Super Scattershot.