I'd suggest the incompatability of the knowledge. He's trying to understand something diametrically opposed to what he understands at present. It's not impossible but tends to send those who try it mad and/or chaotic.
>The case for elements is even more curious, as they are arranged in a
>circle. Is the sorcerer who has learned fire magic really incapable of
>learning Earth magic?
I don't think that can be the case. We know of Gods who are the source of magic from incompatable elements (e.g. Zorak Zoran). I can see it being harder to learn because it is so different.
>Also let's say the sorcerer gains access to the lunar rune. What changes.
>Does it mean that he/she can now ignore the restrictions entirely?
What changes is the source of the magic. They can access all magics through the Moon rather than the Essence plane. I think they could still access the Essence plane if they wanted to but its more difficult and culturally wrong.
-- Donald Oddy http://www.grove.demon.co.uk/
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