no prob,

battle magic are unique of Cerilia , they can only be cast
when 200 mens or things are fighting (basicly a battle) and
you can have like a Rain of magic missile , creating 200
magic missile striking the foes, or maybe the version of
creeping Doom on the battle field , but they shouldn't be
used too much , they will remove the feeling that armored
knights give.....

So remember to do them choose a spell and multiply its
effect by 200 that is what it is......

ciao

Giovanni Garzelli