[Suggestion] Magic damage for spell books

[Heimdal9]

The spell books are cool, but the fact that they do physical damage limits their synergy with other magic mods, particularly those that boost magic damage (like certain items in Malum, etc...). Since they're spells, it would make sense for the spell books to deal magic damage, or perhaps fire damage in the case of Brace.

I suppose optionally you could add support for elemental damage types from Irons / Ars Elemental, but understandable if that is beyond the scope of what you want to support. Basic magic damage, however, seems like a reasonable feature to implement.

And of course, thanks for such an amazing mod!