I've tested it, and I've noticed that if you choose one of the books, you can't use the powers of the other books. So, if you choose earth, you can't cast fire or frost spells.
Just wanted to address this post again, having looked at that part of the script in particular while transitioning to the individual page-based system.
The spell learning method in v0.6 is
broken for Frost spells, at the least. Can't reproduce the reported problem with any of the other books. Shouldn't be an issue in the next revision since I did away with that system, but for people hoping to try out the current v0.6, see the OP spoiler for the variable name controlling the Frost book, and set it to 300. That should give you all the spells for Frost, to side-step the issue for now.
Some ideas:
Earth:
Earth/sand Prison: inprison the enemy on a sphere of sand and crush him
Stone wall: Creates a long duration barrier of stones, a large one, to unable the enemies to reach you
Earth cloning: Makes appear versions of you made from earth that protect you
Open the eart: Makes appear a breech at the ground that takes you to somewhere like it was a portal or something
Air:
Wind: Derribes the enemies with wind. Also could miss the arrows.
Thanks for the ideas =)
1) Sand is a difficult idea to work with, because there are no meshes (to my knowledge) that I could use for it. Maybe a scaled down ash storm, but I don't yet know how that would look...
2) Stone wall: Definitely something I'd like to do, in the style of Wall of Fire from Scripted Spells. I'll have to see what I can glean from his method.
3) Earth cloning: As far as I'm aware, there is no good system in place to work with player clones (can't replicate the player at runtime). But golems animated by Earth magic would be cool. Anyone have a stone atronach mesh textured, animated, and just laying around
?
4) Open the earth: I've thought of a way that this could be done, actually. But the question is, where does the breach take you? I'll have to develop the idea a bit further...
5) Wind: Wind spells are difficult to deal with in the same way as sand, but with a recolored Blight mesh, I think I did a decent job with Tempest/Wind Shear. If there are any other usable wind meshes out there I would be open to more such spells.
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About halfway through the boring transition work....