Thinking about magic for my own game, I was wondering what people thought about magic levels in WHFB.

In 5th ed., magic was all you needed to win. The Forbidden Rod was pretty much mass produced based on how many I ran into (shoulda been called the "Mandatory Rod") and you could pretty much sweep all before you with a solid spellcaster.

In 6th, the balance shifted back at first, but as the books came out, magic again became a key element to victory.

How much is too much?

Specifically, what role to you see magic playing?

Is it artillery, something that reaches out and kills people?

Is it a support, something that shouldn't do direct harm, but instead enhances units so that they can kill?

Or is it the ne plus ultra of warfare, capable of wiping out whole units in a turn?

What do you think?